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Nick Kyrgios' lewd on-court comments about Stan Wawrinka's girlfriend have gone viral.

More: Kyrgios' Lewd Comments Go Viral

Understandably livid, the Roland Garros champion is calling for the ATP to respond to Kyrgios. The ATP announced today it has fined Kyrgios for his "insulting remark."

Wawrinka tweeted out this response to Kyrgios:

So disappointing to see a fellow athlete and colleague be so disrespectful in a way I could never even imagine.

— Stanislas Wawrinka (@stanwawrinka) August 13, 2015

What was said I wouldn't say to my worst enemy. To stop so low is not only unacceptable but also beyond belief.

— Stanislas Wawrinka (@stanwawrinka) August 13, 2015

There is no need for this kind of behaviour on or off the court and I hope the governing body of this sport does not stand...

— Stanislas Wawrinka (@stanwawrinka) August 13, 2015

... for this and stands up for the integrity of this sport that we have worked so hard to build.

— Stanislas Wawrinka (@stanwawrinka) August 13, 2015

Wawrinka's response came after his coach, Magnus Norman, took to twitter for this reaction.

That was really really low Nick Kyrgios. Hope for u that u have people around that will teach u a thing or 2 about life tonight. Very bad👎🏼

— Magnus Norman (@normansweden) August 13, 2015

Just when I thought there was difference between immature and disrespectful #smh #noexcusesforthatone https://t.co/qZRGexSZLm

— Irina Falconi (@IrinaFalconi) August 13, 2015

Fellow players, including Victoria Azarenka, who is a friend of Kyrgios, have weighed in with reaction.

U have to respect ur opponent... Everyone has to... Always

— victoria azarenka (@vika7) August 13, 2015

At least walk away from the microphone 🙈

— victoria azarenka (@vika7) August 13, 2015

For all those asking I imagine ATP supervisors will review the situation from last night and all that can happen to Kyrgios is a fine

— Brad Gilbert (@bgtennisnation) August 13, 2015

Photo credit: Arturo Velazquez/Tennis Canada