There is no shortage of stories of Davids in the 2016 Rio Olympics taking on their toughest and fearsome Goliaths. Who will ever forget the stunning defeat of multi-decorated U.S. Olympian Michael Phelps to a 21-year-old Singaporean Joseph Schooling in the 100m butterfly?

Schooling lived his dream of becoming an Olympian like Phelps to set a new Olympic record of 50.39sec in Rio on Friday and put his island country on the Olympic map by winning its first ever gold medal.

Female world number 1 Serena Williams suffered a double whammy in Rio’s tennis court after she was knocked out of the Olympics in the third round by Ukrainian Elina Svitolina, and was beaten in the doubles with sister, Venus in the first round – their first defeat in 16 Olympic matches together.

Still on tennis, Novak Djokovic — who won both the French and Australian Open this year — lost in the first round of both the men’s singles and doubles tournaments.