A nail-biting tiebreaker at a professional tennis tournament was interrupted thanks to "Cotton Eye Joe!"
The match was as close as it gets at the semifinals of Montreal's National Bank Open ... Jessica Pegula and Iga Swiatek were trading points, with Pegula ahead 4-3 in the tiebreaker.
As the ball was in play, everyone in the venue heard "If it hadn't been for the Cotton Eye Joe" blaring from the speakers ... the chair ump immediately suspended play.
You hear the announcer kinda shocked, but musically knowledgeable, telling the audience, "Oh wow, 'Cotton Eye Joe' just came on mid-rally.