Japanese superstar Naomi Osaka suffered a surprise exit in her home Olympics as Czech Marketa Vondrousova earned a straight-set win in Tokyo.
Osaka, 23, has been one of the faces of the Games in the Japanese capital and had the honour of lighting the Olympic cauldron in last week's opening ceremony.
But the four-time Grand Slam champion could not back that up by winning a medal, losing 6-1 6-4 to the world number 42 in the third round.
"I definitely feel like there was a lot of pressure for this," said the world number two.
"I think it's maybe because I haven't played in the Olympics before and for the first year it was a bit much.