Jessica Pegula defeated Coco Gauff convincingly in an all-American WTA Finals tie

In the semifinals, Coco Gauff, a fellow American and partner in doubles, soundly defeated her in an attempt to become the first teenager to win the WTA Finals since 2004.

In Cancún, Mexico, Pegula, the fifth seed, defeated the 19-year-old US Open champion 6-2, 6-1, in just one hour.

Pegula told reporters, "At the end of the year, I was able to get my act together." "Coming here has helped me reset quite well."

In the championship match, Pegula will face either top-seeded Aryna Sabalenka or second-seeded Iga Świątek. The final has been rescheduled for Monday after the semifinal was postponed due to rain on Saturday after three games. It will resume on Sunday.

Either Sabalenka or Świątek will face a player who hasn't dropped a set in Cancún, having advanced to the final with a 4-0 record and three victories over opponents with higher rankings.

It was her second victory over her countryman Gauff in three encounters. The 29-year-old outplayed her opponent in the challenging conditions, which included rain breaks in the second set and a wind that swirled throughout. Gauff committed 25 unforced errors in total, and the 29-year-old broke her opponent six times.

Gauff would have become the first teenager to win the competition since Maria Sharapova did so in 2004, according to the WTA. In the year's final, a 17-year-old Sharapova triumphed over Serena Williams.