WATCH: Dominic Stricker sings along to Whitney Houston's 'I Wanna Dance With Somebody' at the US Open

NEW YORK (AP) — Closing in on the biggest victory of his tennis career, Dominic Stricker was having a terrific time at the US. Open—so much so that he sang along to Whitney Houston's "I Wanna Dance With Somebody" as it rang out from the stadium speakers during a changeover Wednesday.

Stricker needed to go through qualifying just to get into the field at Flushing Meadows and the 21-year-old from Switzerland moved into the third round of a Grand Slam tournament for the first time by beating No. 7 seed Stefanos Tsitsipas 7-5, 6-7 (2), 6-7 (5), 7-6 (6), 6-3.

"I felt good from the first point on. It was just great to be out there with so many people supporting me, supporting him," Stricker said after the match. "So it was just, for me, a great day. I enjoyed it from the first moment on.

"Yeah, I was down break in the fourth, came back. So just, actually a bit speechless what happened today. It's just great to be in the third round."

Music often plays during breaks between games at the US Open, and Houston's 1987 hit was the choice while the players sat on the sideline at 5-2 in the fifth set of the 4-hour, 4-minute contest.

Between sips of an energy drink and bites on a snack, Stricker bopped his head and bounced his legs to the beat of the song and then began mouthing the lyrics. He appeared to know all the words.

Stricker will take on France's Benjamin Bonzi in the US Open third round on Friday.