Daria Kasatkina vs Veronika Kudermetova will take place in the round of 16 of the 2023 WTA Madrid Open on May 1.
The Latvian smashed four aces, recorded 80% and 78% on the first and second serves respectively, and returned all five available break points to mark a dominant win.
Mertens had only ever won once before in the second round of the 2017 New Haven tournament, giving Kasatkina a 4-1 head-to-head advantage.
Daria Kasatkina and Rebecca Marino will take on each other in the first round of the 2023 WTA Qatar Open on February 14.
Kasatkina and Kvitova are set to face each other in the quarter-final of the 2023 Adelaide International 2 on Thursday, January 12.
The Russian, who started the season outside the top 20, went on to finish with a single-digit ranking.
Coco Gauff and Daria Kasatkina will face each other on Friday, November 4 in the group stage of the 2022 WTA Finals.
The Pole won the French Open and the US Open as well as four WTA 1000 tournaments this season.
Kasatkina returned six out of 11 break points in the match to seal what was a rather comfortable victory over Zhu Lin in the previous round.
Daria Kasatkina and Lin Zhu are scheduled to face each other in the second round of the 2022 WTA Guadalajara Open on Tuesday, October 18.