Roger Federer and Grigor Dimitrov had some free time between their matches at the Australian Open, so they decided to invite Tommy Haas out with them and went to hang out with Canadian musician, record producer and songwriter David Foster.

The trio decided to show off their singing voices as they performed their own version of Chicago’s ‘Hard To Say I’m Sorry’, and you can probably imagine what their performance sounded like.

The trio know that they’re a lot better at tennis than they are at singing, and Federer let it be known with his #NOTNSYNC hashtag. However, as bad as their singing voices are, David Foster laughing at them the entire time and trying to help them with their cues makes it all worthwhile.

 

(H/T Twitter/rogerfederer)