"Cotton Eye Joe" song interrupts Jessica Pegula and Iga Swiatek at crucial moment in Montreal

WATCH: The 'Cotton-Eye Joe' song interrupted Jessica Pegula and Iga Swiatek at crucial moment in Montreal.

Where did you come from, Cotton-Eye Joe? Saturday's Omnium Banque Nationale semifinal match between Jessica Pegula and Iga Swiatek was interrupted at a crucial time by a famous country-pop party anthem.

After Pegula failed to serve out victory at 6-2, 5-4 and book her spot in the WTA 1000 final, the two players were locked in a second-set tiebreak when the meme-worthy moment occurred.

With world No. 1 Swiatek serving down 4-3, with Pegula in, at worst, a neutral position in the rally and, at best, with a chance to lead 5-3, the song "Cotton-Eye Joe" started blaring through the in-stadium speakers.

Thought it was quickly remedied, chair umpire Marija Cicak was forced to call a let, and the point needed to be replayed. After the interruption, a visibly-frustrated Pegula didn't win another point, and Swiatek came back to force a final set.

A rare moment in theory, the saga was, in fact, the second such awkward moment in a match featuring Pegula at the tournament. In the eighth game of the second set of her three-set win over Coco Gauff in the quarterfinals, the in-stadium lights went on mid-point as skies darkened, and also caused a let to be called.

Swiatek's momentum, in fact, continued on into the decider: In all, the Pole won 12 straight points following the pause in play (13 in total, as Pegula led 4-2 at the tiebreak's changeover).

But, Pegula had the last laugh. From 4-2 down in the final set, Pegula rallied for a 6-2, 6-7(4), 6-4 win to reach her third WTA 1000 final.