Jannik Sinner opened his Wimbledon title defense with a shaky 4-6, 6-3, 6-7 (6), 6-2, 6-3 victory over Miomir Kecmanovic, dropping his first two sets before rallying. The world No. 1 committed 15 unforced errors in the opening set and needed five sets to dispatch the 50th-ranked Serbian, despite entering as the heavy favorite.

This performance follows Sinner's stunning French Open second-round exit to Juan Manuel Cerundolo, where he lost 18 consecutive points during a collapse attributed to heat-related dizziness. After skipping grass-court warmups to focus on recovery, Sinner arrived in London early to adapt to the surface and work on heat preparation with his team.

The Italian's vulnerability creates opportunity for the field, with Daniil Medvedev and potential semifinal opponent Novak Djokovic eyeing their chances. Sinner faces Nuno Borges next, then could encounter either rising star Rafael Jodar or Ethan Quinn in the fourth round.

Despite the struggles, Sinner called it an 'amazing day' and expressed satisfaction with handling the pressure of defending champion status on Centre Court. However, his recent form suggests this Wimbledon may be more unpredictable than initially projected.