Watch: Serena Williams says, ‘I am not a cheater’, accuses tennis of sexism

Serena Williams lost the final to Naomi Osaka in women's singles at the US Open 2018 on 8th September. She had an on-court meltdown after she lost the match and was penalized for illegal coaching from the sidelines by Patrick Mouratoglou.The headlines were supposed to be about Williams' bid for a record-equalling 24th grand slam title and Osaka trying to become Japan's first slam winner, but instead an argument with umpire Carlos Ramos that escalated dominated the match.Williams was furious when she was given a coaching violation early in the second set after a hand gesture from her coach Patrick Mouratoglou. She said, 'There's a lot of men out here that have said a lot of things and because they're a man, that doesn't happen to them.'The fall-out from this final is likely to rumble on for some time. The long-time coaching partnership between Williams and Mouratoglou is also under strain.