U.S. gymnast Simone Biles dropped out of the women's team event after a single vault at the Tokyo Games on Tuesday while tennis superstar Naomi Osaka exited only days after lighting the Olympic flame.

The International Gymnastics Federation said Biles would play no further part in the team event, but said she would still receive a medal if the heavily favored U.S. ended up on the podium.

"Simone has withdrawn from the team final competition due to a medical issue," said USA Gymnastics. "She will be assessed daily to determine medical clearance for future competitions."

Biles had been bidding for a record six gold medals in Tokyo.

Osaka, who lit the Olympic cauldron on Friday to open the Games after a one-year postponement, looked out of sorts and never settled into a rhythm as she lost 6-1 6-4 in the third round to Czech Marketa Vondrousova.