Jannik Sinner advanced to the fourth round at Wimbledon following a 6-4, 6-3, 6-4 victory over American opponent Jenson Brooksby on Friday, despite concerns over his stamina amid rising temperatures in London. The Italian, seeded number one, overcame a competitive challenge from Brooksby, who broke his serve multiple times and forced Sinner to save match points before closing out the win.

Sinner’s performance showed improvement after a slow start to the tournament, with his power and consistency ultimately proving decisive. He maintained pressure with strong baseline play and occasional net approaches, responding resiliently to Brooksby’s aggressive groundstrokes. Brooksby, ranked 81st globally, applied significant pressure early, breaking Sinner’s serve twice and serving for the match in the third set. However, Sinner’s composure under pressure saw him reverse the momentum to secure the straight-sets win.

The match renewed discussions about Sinner’s endurance, following his recent loss at the French Open where he surrendered a two-set lead and a 5-1 advantage. With a heatwave forecast for London in the coming days, questions remain about how the 21-year-old Italian will manage the physical demands of extended play under increasing temperatures.

Brooksby, who has faced challenges including a period without match wins earlier this year and a suspension linked to drug test violations, demonstrated fighting spirit and drew support from the crowd. The American has publicly disclosed an autism diagnosis and was once ranked as high as world number 33. While he put up a strong fight, Sinner’s power and precision ultimately secured his progression.

In the next round, Sinner is set to face qualifier Shintaro Mochizuki, who reached the fourth round after an upset victory over Spanish teenager Rafael Jodar. Mochizuki, who won the Wimbledon boys’ singles title in 2019 and later defeated Carlos Alcaraz in the ITF World Junior Tennis Finals, expressed surprise at his recent winning streak at the tournament. Standing at 5 feet 9 inches, Mochizuki competes in an era dominated by taller players but has shown adaptability on grass courts.

Sinner described Mochizuki as “very dangerous” and acknowledged the challenge ahead. Despite not being known for on-court theatrics, Sinner appeared receptive to increased crowd engagement during his match with Brooksby, who garnered enthusiastic support with his spirited play. After the match, Sinner noted his difficulty closing out the contest despite having match points and credited the crowd’s energy for helping him secure victory.

While Sinner’s style is marked by restraint rather than flamboyance, his solid fundamentals and competitive resilience have kept him on track for a deep run at Wimbledon. Analysts note that his 26 unforced errors in the latest match and the competitiveness of his opponent highlight areas for improvement. As the tournament progresses and temperatures rise, attention will focus on Sinner’s ability to maintain his form without succumbing to fatigue.