When Venus Williams pushed one last forehand long to lose in the first round for the first time in her record five Olympic singles tournaments, her opponent celebrated as if having claimed a gold medal, dropping down on the green hard court to plant a kiss on the white five-ring logo.

This was clearly a very big deal to Kirsten Flipkens, a Belgian ranked 62nd and who has only once gone as far as the semi-finals at a grand slam event.

Just two points away from winning on four occasions while portions of the crowd turned hostile toward her, the 36-year-old Williams faded as Saturday night’s match stretched past three hours and she was stunned 4-6, 6-3, 7-6 (7-5) by Flipkens on day one of tennis at the Rio Olympics.

Afterward, Williams did not speak to reporters. Instead, US women’s tennis coach Mary Joe Fernandez did, saying that Williams was sick before arriving in Brazil, affected by a virus that made her cough during the match. Fernandez added that Williams had cramping, dehydration and an upset stomach after her loss, but still hoped to play doubles on Sunday with her younger sister Serena.

Williams owns four gold medals: one in singles and three in doubles. She owns 21 Grand Slam titles: seven in singles, 14 in doubles. But she labored at times Saturday and even showed frustration by shouting “Ridiculous!” after dropping one point.

With the US Secretary of State John Kerry watching from a second-row seat behind a baseline, the fifth-seeded Williams wasted a 4-1 lead in the final set and was broken while serving for the victory at 5-3.

Williams is the first tennis player to participate in singles at five Olympics, and never had failed to reach at least the third round before, claiming a gold at the 2000 Sydney Games. She also won doubles golds in 2000, 2008 and 2012.

But against Flipkens, who was making her Olympic debut, Williams failed to find the right measure on most of her strokes and wound up with 13 fewer winners. Williams, once possessor of one of the best serves in women’s tennis, hit one ace, five fewer than Flipkens.

The fans couldn’t seem to settle on which woman they wanted to win. They greeted Williams far more loudly and warmly during prematch introductions, although perhaps that was because of her far-greater name recognition.

Later, though, they roared when Williams made mistakes. They clapped when she double-faulted. They even gave her grief for the common and innocuous practice of catching a ball toss that wasn’t good.

When one group of spectators bellowed a “USA! USA!” chant late in the third set, others responded by booing (Kerry had left by then). Williams’ loss was part of a rough day for the United States tennis team. Seven of the country’s eight singles players were in action, and they went 2-5.

(Associated Press)