Following her 5-7, 7-6(7-4), 1-6 defeat against Australia's Ajla Tomljanović in the US Open's third round, marking her career's last match, Serena Williams said her sister Venus Williams is the "only reason" she ever existed. "It's been the most incredible...journey I've ever been on...in my life," added Serena. "It all started with my parents and they deserved everything," she stated.