For the first time in her Olympic career, world number one Serena Williams will be heading home without a medal.
Having lost in the first round of the doubles event with her sister Venus, Williams was looking to make amends in the women’s singles, but on Tuesday night she came unstuck in spectacular fashion.
Facing 15th seed Elina Svitolina for a spot in the quarter-finals, a sluggish Williams could not muster anything near her best in a 4-6, 3-6 defeat.
After trading breaks early on, Svitolina edged ahead when she broke Williams in the seventh game to take a 4-3 lead and held on to clinch the first set.
It was a similar story at the start of the second set as Svitolina claimed a 3-1 lead after breaking Williams in the third game. The top seed fought her way back into contention by levelling the scores at 3-3.
However, it would prove to be just a momentary recovery, as Svitolina claimed two further breaks to claim the set 6-3 and with it the biggest upset of her career.
Joining Svitolina in the quarter-finals is the Czech Republic’s Petra Kvitova, Puerto Rico’s Monica Puig, Germany’s Laura Siegemund and Angelique Kerber, Great Britain’s Johanna Konta, Russia’s Daria Kasatkina and the USA’s Madison Keys.