Watch: Federer's wife called Wawrinka a "cry baby" in London

According to video and translation provided by The Telegraph and BeIn Sport, Stan Wawrinka did take issue with Roger Federer's wife Mirka during their semifinal clash on Saturday at the ATP World Tour Finals in London and there may still be tension within the Swiss Davis Cup team.

According to video and translation provided by The Telegraphand BeIn Sport, the rumors of tension within the Swiss Davis Cup team between Roger Federer and Stan Wawrinka may not be entirely baseless. As it turns out, Wawrinka did take issue with Federer's wife Mirka during their semifinal clash on Saturday at the ATP World Tour Finals in London. 

Late in the third set, Wawrinka backed away from the line as Federer was about to serve, turned to Federer's courtside supporters' box and said, "Not just before the serve, not just before the serve.” According to courtside photographers and French TV, it was Mirka who then shouted "cry baby." Incredulously, ​Wawrinka turned towards Federer and asked, "Did you hear what she just said?" The chair umpire Cedric Mourier confirmed tension with Mirka and said Wawrinka told him, "She did the same thing at Wimbledon," during their quarterfinal match in July. ​Wawrinka would go on to lose the match on Saturday at the year-end championships after having four match points.

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Asked about the incident after the match, an emotional Wawrinka shrugged it off. "Nothing special," he told reporters, with a grin. "Tense match. It's never easy." Federer and Wawrinka addressed the press in Lille on Tuesday in advance of this weekend's Davis Cup final. Federerconfirmed the two had a disagreement but had put it behind them after discussing the incident after the match in the locker room, while Wawrinka downplayed the incident and blamed the media for blowing it out of proportion. 

[tweet=https://twitter.com/rogerfederer/status/534469576335962112]

Of course, this isn't the first time this year Stan has lashed out at a courtside heckler. Remember when he told a fan to "shut up" during the U.S. Open? ​The man likes to work in silence. 

The bigger issue for the Swiss team is the health of Federer's back. Federer was forced to give No. 1 Novak Djokovic a walkover at the ATP Finals due to a back injury he suffered against Wawrinka. Federer told reporters on Tuesday that the back feels better than it did on Sunday but he is still unable to practice. 

This just about sums it up:

[tweet=https://twitter.com/SwissMinipeople/status/534356878458122240]