Serena Williams defeated in third round of US Open

Former top-ranked tennis player Serena Williams has been defeated in the third round of the US Open after a heated match that lasted more than three hours.

The 40-year-old American icon has hinted that this was likely to be her final tournament.

Williams lost to 46th-ranked Australian Ajla Tomljanovic by a set count of one to two on Friday, the fifth day of the tournament.

Williams lost the first set 5-7. She took the second set 7-6 after a tie-break, but lost the third set 1-6.