Jessica Pegula advanced to the WTA Finals title match after defeating Coco Gauff, despite weather issues.
The match between Aryna Sabalenka and Iga Swiatek was suspended due to rain, with both players vying for the year-end number one ranking.
Sabalenka, the world's number one player, and Swiatek, the number two player, played only three games before rain halted their match.
The winner of their match would face Pegula, who has been dominant on the outdoor hardcourts in Cancun.
Pegula overcame a late rain delay and windy conditions to beat US Open champion Gauff.
She executed her game plan well, adapting to the challenging weather conditions.
The tournament has been plagued by weather-related disruptions all week, with players expressing their dissatisfaction.
WTA Tour CEO Steve Simon acknowledged the challenges and accepted responsibility for the tournament conditions.
Tennis legend Martina Navratilova called for a change in leadership and criticized the decision to hold the event in Cancun during the rainy season.
The WTA Finals in Cancun have been marked by unpredictable weather, affecting matches and prompting calls for improvements in future tournaments.