Rio 2016: Defending Olympic champion Serena Williams shocked in third round by Elina Svitolina

Defending champion Serena Williams is out of the Rio Olympics after losing to Uktaine's Elina Svitolina in straight sets in the third round. Williams may not have been at her best and may have had a shoulder injury but her exit still comes as a shock. It is an upset, whichever way you look at it.

Williams, the no. 1 player in the world, was beaten 6-4, 6-3 on Tuesday, 9 August. Svitolina had never beaten Williams before. Williams had a 4-0 record but all of that didn't matter in Rio. Williams made 37 unforced errors, including eight double-faults - five of which came in one game.

Williams will not be earning her third consecutive Olympic gold medal anymore. Williams never got into her rhythm throughout the match. Svitolina came in to the match as the 20th ranked player in the women's singles competition. Prior to the match and even prior to the Games, no one even gave her a chance of upsetting Williams.

"It's an unreal feeling for me. This is just a perfect moment," Svitolina aid after her win.

It may only be Day 4 of the Games but Williams time in Rio de Janeiro has come to an end. She and sister Venus had earlier lost on Sunday in the first round of the women's doubles competition.

Next up for the 21-year-old Petra Kvitova.