The previous day's rain meant that this would be the first of two matches in the same day for the winner. The WTA World No.18 said afterwards: "It was important to get through this match as quick as possible, just trying to save my energy. But she's a tough player, serving well and aggressive, so I'm happy to be through in two sets and hopefully ready for the next one."
This was the first time the pair had met since 2012 and Wozniacki picked up where she left off if Montreal a little over four years ago. She won 7-5, 6-1 then and here broke her big-serving opponent three times in the first set for 6-2.
Bertens - who, at Roland Garros last year, became the first Dutch player to reach a slam semifinal since 1977 - called for her trainer between sets and looked to take up a more aggressive approach from the start of the second set. The World No.22 became more proactive, taking control of the rallies to force Wozniacki back with some mighty cross-court forehands and was rewarded with an immediate break.
? WTA (@WTA) February 15, 2017
However Wozniacki would not be behind for long, as might be expected of a player with 20 hard-court singles titles to her name and reclaimed the break in the sixth game. Bertens fought hard to prevent the consolidating hold but Wozniacki came through and followed that with a third break, sealed when the Dutch player double faulted for the second time in the game and fifth in the match.
Despite the best efforts of Bertens, who secured two points with gloriously powerful forehand passes, Wozniacki served out to set up a second-round clash with Agnieszka Radwanska - the 16th time the pair will have met.
"She's a tough opponent," Wozniacki said of her familiar upcoming foe. "She was seeded very high so she got a bye and she's probably been watching us grind it out this morning. But at least I'm warm and can hopefully keep the momentum going."