You have to watch it to believe it... Even the announcers didn't think what they were hearing was real life!
In the video about 15 seconds in you can hear a faint moan, one of the tennis players reacts and then the announcers start coming up with scenarios. At first they thought someone in the stands was watching an adult video on their phone...
NOPE! If you skip to about 1min and 50secs you'll hear it again and then everyone realizes that the noise is a REAL couple getting it on hahahahhaha!