Jannik Sinner returns the ball to Miomir Kecmanovic during a men's singles match at the Wimbledon Tennis Championships in London on Monday. (AP photo)

LONDON — Defending champion Jannik Sinner had to come back from a set down twice and regain his composure following a worrisome tumble to the grass in a five-set victory over 50th-ranked Miomir Kecmanovic in the first round of Wimbledon on Monday.

A month after his French Open meltdown, the top-ranked Sinner produced a 4-6, 6-3, 6-7 (6-8), 6-2, 6-3 win that lasted 3 hours and 30 minutes in the opening match on Centre Court, which by custom is reserved for the past year’s men’s singles champion.

Sinner said he was “a little tight in the beginning,” noting that it was his first grass-court match of the season.

“I’m happy that I turned it around,” Sinner said.

Lleyton Hewitt, the 2002 champion, remains the only Wimbledon men’s singles winner in the professional era (since 1968) to lose in the first round the following year. The Australian was defeated by Ivo Karlovic in his 2003 opener.

In another Centre Court match, seven-time champion Novak Djokovic had Bad Bunny cheering him on during a 6-4, 5-7, 6-4, 6-4 victory over 102nd-ranked Wu Yibing that ended with the retractable roof closed and the lights turned on due to darkness. Djokovic improved to a perfect 21-0 in the opening round at Wimbledon.

Serena Williams will play her opening match today against 20-year-old Maya Joint of Australia — marking the first time she competes in singles in nearly four years.

Sinner hadn’t played an official match since he struggled with dizziness during a heat wave at Roland Garros, where after being within one game of concluding his second-round match in straight sets, he was beaten by Juan Manuel Cerundolo in five.

The match with Kecmanovic was played in ideal conditions, with sunny skies and the temperature 75 degrees F.

Sinner is a big favorite to repeat as Wimbledon champion since his main rival Carlos Alcaraz, who he beat in last year’s final, is missing the championships due to a right wrist injury.

Early in the third set, Sinner drew a loud applause when he executed a sliced stop-volley drop shot that was so good Kecmanovic didn’t even run for it. But in the same game, Sinner fell hard to the grass when he lost his footing trying to change directions. He went down on his knees and fell backwards grimacing in pain as he grasped what appeared to be his left hip area. But he quickly got up and resumed playing.

As the match wore on, Sinner appeared to be bleeding through his right shoe.

“I’m good,” Sinner said. “It just seems much worse than it is. … It’s just a nail.

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AP tennis: https://apnews.com/hub/tennis