Serena Williams has bid an emotional goodbye to the US Open with a third-round loss to Australian Ajla Tomljanović, in what is likely the last match of the American's glittering career.
The 40-year-old came out swinging and sent the match into a decider by winning a second-set tie-break, but Tomljanović showed nerves of steel to take down the tennis icon, even apologising for doing so after the match.
