Defending champion Serena Williams is out of the Olympics after losing to Ukrainian Elina Svitolina in the third round of the women’s singles.
Svitolina, ranked 20 in the world, stunned the London Games gold medalist 6-4 6-3 to record a memorable victory against the American.
Serena, who has won 22 Grand Slam singles titles, looked out of sorts as she crashed to another shock defeat in a desperately-disappointing Games for her.
Williams was visibly frustrated throughout the match as she struggled to find her range, making 37 unforced errors compared to 17 by Svitolina.
The world number one’s struggles were highlighted by five double faults in the seventh game of the second set.
“It didn’t work out the way I wanted it to but at least I was able to make it to Rio – that was one of my goals,” Williams said.
“The better player today won but I know next time is going to be a really good match and I look forward to it.”
Williams and sister Venus were knocked out of the women’s doubles on Sunday by Czech Republic pair Lucie Safarova and Barbora Strycova.
Svitolina, who will face the Czech Republic’s Petra Kvitova in the quarter-finals, said: “It’s an unreal feeling for me. This is just a perfect moment.”