Serena Williams out of Wimbledon after losing first-round thriller

Serena Williams tasted bitter defeat on her return to singles tennis at Wimbledon on Tuesday as Rafael Nadal overcame a huge scare to progress to the second round.

Elsewhere on day two of the Championships, title contender Matteo Berrettini was forced to pull out with coronavirus while women's top seed Iga Swiatek extended her winning streak to 36 matches.

Seven-time champion Williams went down to unseeded Harmony Tan of France 7-5, 1-6, 7-6 (10/7) in her first singles encounter since an injury forced her out of her first-round match at Wimbledon last year.

Williams, 40, won the last of her Wimbledon singles titles six years ago but reached the final in 2018 and 2019.

"I'm so emotional now," said Tan. "She's a superstar. When I was young, I was watching her so many times on the TV.

"For my first Wimbledon it's wow - just wow.

"When I saw the draw, I was really scared. She's such a legend. I thought if I can win one game, two games, that would be really good for me."

Williams was far below her imperious best on Tuesday, struggling from the start with her form and fitness.

The 23-time Grand Slam singles champion, cheered by the crowd as she made her entrance, lost the first set but broke early in the second set and went on to level the match.

But she faltered while serving for the match and faded badly in the third-set tie-break after taking a 4-0 lead.

She finished with 61 winners but 54 unforced errors the 3-hour, 11-minute evening match.

What a moment ?? pic.twitter.com/uVH0UkkGMt

Earlier, an off-key Nadal, already halfway to a calendar Grand Slam after winning the Australian Open and French Open, dug deep to beat Francisco Cerundolo 6-4, 6-3, 3-6, 6-4.

The two-time Wimbledon champion, who has not played at the tournament since