WATCH: Raonic gave the home crowd something to cheer for when he upset Frances Tiafoe on Monday.

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Is there a Michael Bublé hiding amid the ATP ranks?

The hilarious (and slightly sadistic) National Bank Open team tried to find out by challenging its top ATP stars to an a capella rendition of “O Canada,” the Canadian national anthem.

It turns out no one’s singing is as strong as their swing volleys.

“Oh my god,” exclaims an anxious Holger Rune. “I have to sing? This is so awkward.”

Canadian Félix Auger-Aliassime embraced the anthem with his inimitable aplomb, but countryman Milos Raonic needed a little help getting started.

“What’s the rhythm of it?”

Wild cards Vasek Pospisil and Alexis Galarneau treated fans to an enthusiastic chorus, but how did Frances Tiafoe and Casper Ruud handle the verses?

Check out the full video to find out!