The WTA has apologised after Jessica Pegula was caught calling Mirra Andreeva a ‘diva’ in a hot mic incident.The world no.5 was practising ahead of the WTA Finals in Indian Wells when the comments were made.Pegula was unaware her conversation with coach Knowles was being broadcastGettyPegula, daughter of $12billion oil and gas tycoon Terry Pegula, was unaware that audio was being recorded as she spoke to coach Mark Knowles.Footage of her practice session was live-streamed and posted onto the WTA’s own YouTube channel. What did Jessica Pegula say?Pegula was heard talking about Conchita Martinez, Andreeva’s coach and a former Wimbledon champion.She said Martinez was ‘very nice’ but had ‘lost a little respect for her’ because of 19-year-old Andreeva’s on-court behaviour.Pegula then says of Andreeva: “This girl, I think she’s a nice girl, but she’s a diva, she needs to be humbled.”She then added: “If I was a coach and my girl, you just played four great games, and you’re up four-zero, and you’re mad at me, hitting balls at me, I would be like, first of all, [that’s] disrespectful to the other person. You’re four-zero, shut the f***…” Pegula added: “Conchita pokes her and eggs on her behaviour.” The comments quickly went viral on social media with another clip of her saying Andreeva would be ‘better than [Coco Gauff]’ if she had her fellow American’s ‘mentality’.Andreeva’s on-court behaviour has drawn attention due to a series of emotional outbursts, racquet smashes, and clashes with crowds and officials. Pegula’s agent responseChris McCormack, Pegula’s agent, said she had been ‘completely unaware’ the conversation was being broadcast.View Tweet: https://t.co/wgyOyL8E9r“Naturally it’s been an unfortunate situation for everyone involved,” McCormack told the BBC.“Jess has since been in direct contact with those involved, which she felt was important to do personally rather than through the media.”WTA apologyThe WTA said that it had not properly informed that microphones would be able to pick up comments made by players during their practice sessions.A statement read: “The WTA takes full responsibility for failing to inform our players and their teams that microphones, in place to give fans a livestream of players’ practice, were active on the courts at the WTA Finals. “We sincerely apologise for failing to meet our responsibility to ensure players and coaches were properly informed.” WTA FinalsThe season-ending WTA Finals will begin on Sunday and run through to November 15.Andreeva is coached by former Wimbledon champion MartinezGettyIt is being held in Indian Wells after being moved from Saudi Arabia due to conflict in the Middle East.Pegula faces Coco Gauff in her first match on Sunday.