Was Sloane Stephens cheering Serena's loss?

She says she wasn't and the video would seem to back her up.

Sloane Stephens was mocking someone, but she insists it wasn't Serena Williams.

Much has been made of the supposedly contentious relationship between Sloane Stephens and Serena Williams, but is it so bad the young star would laugh and cheer at her elder's demise?

A video making the rounds on social media had many tongues wagging, as it appeared to show Stephens laughing and trying to high five a friend as Ana Ivanovic celebrated her stunning win over Williams in the fouth round of the Australian Open.

But Stephens insists that's not the case ... and she has a pretty good defense.

"We were just having some fun," said Stephens, who was sitting next to hitting partner Andrew Fitzpatrick in the players' lounge.

"At the end of the match, Ivanovic's coaches pretty much gave each other head butts and kisses. I thought that was the funniest thing ever because I have never seen a more excited head butt-kiss at the end of a match."

"Andrew and I were like, 'Oh my God.' We were going to do the same thing. We were so excited. We had a lot of time on our hands obviously."

Watch the side-by-side video of the reactions below and see what you think.  

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