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19 May 2026Polyvagal theory, domestic pressure, and uncertainty management in the triumph that rewrote the history of Italian tennis Today, May 17, 2026, on the Center Court of the Foro […]
Today, May 17, 2026, on Center Court at the Foro Italico, Jannik Sinner defeated Casper Ruud 6-4, 6-4 and added his name to the Internazionali BNL d'Italia's roll of honor for the first time, fifty years after Adriano Panatta. But it's not just a tennis victory: it's a high-definition sports psychology case study, broadcast live worldwide.
In the days leading up to the final, three incidents captured the attention of fans, coaches, and researchers: Sinner's illness during the semifinal against Medvedev (with tremors, nausea, and sudden shortness of breath), the night's forced interruption due to rain after a match he was almost won, and his management of the enormous pressure of completing the Career Golden Masters on home soil. This article analyzes each incident with the support of scientific literature, offering readers—athletes, coaches, and sports psychologists—concrete and immediately applicable tools.
Medvedev's illness: Polyvagal theory in action
What happened on the field
During the second set of the semifinal against Daniil Medvedev, Sinner showed sudden and visible symptoms: difficulty breathing, retching, muscle stiffness in his lower limbs, and buckling in his legs.
After dominating the first set 6-2, the champion seemed on the verge of collapse. Yet he won the third set 6-4, advancing to the final.
An interpretation
Looking at the images of those minutes, a psychological and neuroscientific analysis of Sinner's behavior suggests an interpretation other than a simple physical crisis or panic attack.
It's likely that what we witnessed was a form of autonomic nervous system self-regulation. When acute muscle pain strikes during high-intensity activity, the amygdala—the subcortical structure responsible for detecting threats—receives an alarm signal that can trigger a massive sympathetic response: cortisol, adrenaline, peripheral vasoconstriction. The result, in an athlete already at the limit, can be exactly what we saw: nausea, shortness of breath, stiffness.
What's significant, however, is Sinner's response to that moment. Leaning forward, leaning on his racket, and beginning a visibly deep and forced breathing from the diaphragm: these don't look like the movements of someone collapsing, but of someone following a protocol. It's very likely that he was stimulating the vagus nerve through abdominal pressure and slow breathing—a well-documented mechanism for activating the nervous system's parasympathetic brake and interrupting the stress cascade (Zaccaro et al., 2018; Porges, 2011).
In the third set, Sinner regained his dominance. That struggle wasn't a sign of a collapse: it was the process by which he prevented it.
The scientific basis: Polyvagal theory
The Polyvagal Theory, developed by psychiatrist and neuroscientist Stephen Porges (1994, 2011), describes how the autonomic nervous system—and in particular the vagus nerve—regulates physiological responses to stress. The vagus nerve (cranial nerve X) is the main mediator of the parasympathetic nervous system: its activation slows the adrenergic response, reduces heart rate, and lowers cortisol levels. Deep, slow diaphragmatic breathing is one of the most effective and rapid mechanisms for stimulating vagal tone. Recent research (Zaccaro et al., 2018, published in Frontiers in Human Neuroscience) demonstrates that slow breathing (4–6 breaths/min) increases heart rate variability (HRV) and reduces activation of the hypothalamic-pituitary-adrenal axis, lowering serum cortisol within 60 to 180 seconds. Exactly what Sinner did between one point and the next.
Scientific references
Porges, S.W. (1994). The polyvagal theory: Phylogenetic substrates of a social nervous system. International Journal of , 42(2), 123-146.
Porges, S.W. (2011). The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-regulation. W.W. Norton & Company.
Zaccaro, A. et al. (2018). How Breath-Control Can Change Your Life: A Systematic Review on Psycho-Physiological Correlates of Slow Breathing. Frontiers in Human Neuroscience, 12, 353.
Thayer, J.F. & Lane, R.D. (2009). Claude Bernard and the heart–brain connection: Further elaboration of a model of neurovisceral integration. Neuroscience & Biobehavioral Reviews, 33(2), 81-88.
Practical application for athletes and coaches
| Problem | Signs of ANS overload during performance (nausea, shortness of breath, sudden cramps) |
| Wrong instinctive response | Irrigidirsi, accelerare il gioco per “uscire” dalla situazione, reprimere la respirazione |
| Sinner Protocol | Forward bending, forced diaphragmatic breathing 4-6 breaths/min, mechanical vagal stimulation |
| Recovery time | 60-180 seconds for measurable reduction in cortisol (Zaccaro et al., 2018) |
| Trainability | Vagal tone is trained with regular practice: HRV biofeedback, mindfulness, breath yoga |
Playing at home: the paradox of domestic pressure
Sinner had never won the Italian Open. In 2023, he exited in the third round, in 2024 he missed the tournament due to injury, and in 2025 he lost the final to Alcaraz. This year, he arrived with five consecutive Masters 1000 titles, a streak of 30 straight victories, and the pressure of completing the Career Golden Masters in Rome, right in front of his home crowd. Precisely the cocktail that scientific research identifies as a choking trigger.
The phenomenon of 'choking under pressure'
The term ‘choking’ describes the acute deterioration of performance under high-pressure conditions. Beilock & Carr (2001, Journal of Experimental Psychology: General) demonstrated that high social pressure interferes with the procedural memory of motor automatisms, redirecting cognitive resources toward explicit monitoring of movements that are normally performed automatically. In elite tennis, this translates into missed serves at crucial moments, unforced errors, and loss of rhythm.
The home-pressure paradox is well documented: research by Baumeister & Steinhilber (1984, published in the Journal of Personality and Social Psychology) analyzed home vs. away matches in the decisive stages of sports championships, finding that home teams/athletes showed significantly higher error rates in situations of maximum pressure—the so-called ‘home choking effect’ in finals.
Despite all this, Sinner won. How? The key fact is in his post-tournament statement: "It wasn't a perfect match, there was a lot of tension, but I'm happy with how I handled the situation." Managing—not eliminating—pressure is the hallmark of champions.
Scientific references
Beilock, S.L. & Carr, T.H. (2001). On the fragility of skilled performance: What governs choking under pressure? Journal of Experimental Psychology: General, 130(4), 701-725.
Baumeister, R.F. & Steinhilber, A. (1984). Paradoxical effects of supportive audiences on performance under pressure: The home field disadvantage in sports championships. Journal of Personality and Social Psychology, 47(1), 85-93.
Beilock, S.L. (2010). Choke: What the Secrets of the Brain Reveal About Getting It Right When You Have To. Free Press.
Masters, R.S.W. (1992). Knowledge, knerves and know-how: The role of explicit versus implicit knowledge in the breakdown of a complex motor skill under pressure. British Journal of Psychology, 83(3), 343-358.
The Night of Interruption: Managing the Psychological 'Limbo'
The episode
At 4-2 in the third set of the semifinal against Medvedev, with the match virtually in hand, rain interrupted play. Sinner had just regained his rhythm and confidence after his physical collapse in the second set. The match resumed the next day. A full night in between, with victory just a few games away but all the tension to manage. As Sinner himself said: "I struggled to sleep. It's a situation I've never been in before—you have to finish the match the next day, you sleep and you don't know what's going to come out."
The psychology of forced waiting
The psychology of anticipation in high-stakes contexts is a relatively recent field of research but one with rich practical implications. The key concept is that of action interruption, studied by Mandler (1984): when a planned action is interrupted before completion, it generates a physiological response of autonomic activation—essentially an anxious arousal—that can persist for hours.
Research on pre-performance routines (Cotterill, 2010, International Review of Sport and Exercise Psychology) demonstrates that athletes with well-established routines maintain more stable performance even under conditions of program interruption or disruption. The routine acts as a 'cognitive anchor,' returning the athlete to their optimal mental state regardless of external circumstances.
In Sinner's case, his demonstrated ability to resume the match the following day with immediate increased aggression and lightness of foot—as described by the commentators present—suggests specific work on reset routines: the ability to 'reset' the mental state after prolonged interruptions.
Scientific references
Mandler, G. (1984). Mind and Body: Psychology of Emotion and Stress. W.W. Norton & Company.
Cotterill, S.T. (2010). Pre-performance routines in sport: Current understanding and future directions. International Review of Sport and Exercise Psychology, 3(2), 132-153.
Bortoli, L. et al. (2012). Competence, achievement goals, motivational climate, and pleasant psychobiosocial states in youth sport. Journal of Sports Sciences, 29(6), 633-641.
Gucciardi, D.F. & Dimmock, J.A. (2008). Choking under pressure in sensorimotor skills: Conscious processing or depleted attentional resources? Psychology of Sport and Exercise, 9(1), 45-59.
Practical protocol: managing forced interruption
| Phase 1 – Acceptance | Recognize the interruption as a neutral event, not a threat. Technique: cognitive defusion (ACT, Hayes et al., 2006). |
| Phase 2 – Anchoring | Apply the same pre-performance routine as usual: order, timing, physical sensations. Signal to the brain: 'We're in race mode.' |
| Phase 3 – Attentional Reset | Focus on the next point, not the match as a whole. Focus on the present: 'One point at a time.' |
| Phase 4 – Physical recovery | Standardized warm-up to restore neuromuscular activation. Don't skip this step. |
Career Golden Masters: The Weight of History in Champions
Completing the Career Golden Masters—winning all nine ATP Masters 1000 titles—is a feat only Novak Djokovic had achieved in tennis history. Sinner arrived in Rome with eight of nine wins under his belt, the longest winning streak on the tour, and his home tournament as the setting for a potential historic moment. A situation of "record pressure" familiar to sports psychology.
Intrinsic motivation vs. record pressure
Self-Determination Theory (Deci & Ryan, 2000) distinguishes between intrinsic motivation—doing something for pleasure and personal meaning—and extrinsic motivation—doing something for rewards, records, or external recognition. Research consistently shows that intrinsic motivation produces more stable and resilient performance under pressure, while extrinsic motivation increases vulnerability to choking.
Sinner demonstrated this distinction crystal-clearly. When asked about the record, before the final, he replied: "I'm happy to be here in the final. It's a special tournament for me and for the Italians, I'll try to do my best." He didn't mention the Career Golden Masters, the 50-year wait, or the record. He focused on the present experience. A motivational framing technique that research identifies as a marker of high athletic psychological maturity.
Flow and optimal performance
Csikszentmihalyi (1990) describes flow as a mental state of total absorption in the task, characterized by an absence of self-consciousness, a distorted perception of time, and spontaneously optimal performance. The conditions for flow include a balance between challenge and competence, clear goals, and immediate feedback—all present in an elite tennis match.
The paradox of Sinner's case is that the moment of maximum historical pressure (the record, the crowd, turning 50) could have prevented flow. Instead, his ability to narrow his focus to the 'next point'—a technique documented in elite athletes by Jackson & Csikszentmihalyi (1999)—preserved the conditions for optimal performance.
Scientific references
Deci, E.L. & Ryan, R.M. (2000). The ‘What’ and ‘Why’ of goal pursuits: Human needs and the self-determination of behavior. Psychological Inquiry, 11(4), 227-268.
Csikszentmihalyi, M. (1990). Flow: The Psychology of Optimal Experience. Harper & Row.
Jackson, S.A. & Csikszentmihalyi, M. (1999). Flow in Sports: The Keys to Optimal Experiences and Performances. Human Kinetics.
Vallerand, R.J. et al. (2008). On the role of passion in performance. Journal of Personality, 76(3), 505-534.
Ruud's Mind: Facing the 'Impossible' Opponent
Casper Ruud entered the final with a 0-4 record against Sinner, having never won a set. In the last two matches, he had won just four games. His pre-final statement became an inadvertent case study in cognitive psychology: "Ultimately, it's human—I have to think that way as much as possible."
This statement reveals Ruud's internal battle with the cognitive bias that researchers call learned helplessness (Seligman, 1972): the tendency, after repeated losses against the same opponent, to internalize the idea that defeat is inevitable, generating negative self-fulfilling expectations.
Ruud demonstrated metacognitive awareness in recognizing this risk: "I have to stay in my lane, focus on the things I do well. I know against him you have to raise the bar two or three times to keep up with him.’ This strategy—focusing on the process rather than the opponent—is at the heart of the Acceptance and Commitment Therapy (ACT) approach applied to sport (Gardner & Moore, 2007).
Scientific references
Seligman, M.E.P. (1972). Learned helplessness. Annual Review of Medicine, 23(1), 407-412.
Gardner, F.L. & Moore, Z.E. (2007). The Psychology of Enhancing Human Performance: The
Mindfulness-Acceptance-Commitment (MAC) Approach. Springer.
Dweck, C.S. (2006). Mindset: The New Psychology of Success. Random House. [Growth mindset applicato alla gestione delle sconfitte ripetute]
Wilson, M. (2008). From processing efficiency to attentional control: A mechanistic account of the anxiety-performance relationship. International Review of Sport and Exercise Psychology, 1(2), 184-201.
