Iga Swiatek missed out on a place in the WTA Finals title match after a surprise defeat against Aryna Sabalenka on Sunday but the world No. 1 said she is happy her "intense" season is finally at an end.
The Pole, who went on a 37-match winning streak earlier in the year, won the French and U.S. Open crowns as well as titles at Doha, Indian Wells, Miami, Stuttgart, Rome and San Diego.
Swiatek, 21, was hot favorite to finish the year with the season-ending title at the WTA Finals in Fort Worth, Texas, but was beaten 6-2, 2-6, 6-1 by Sabalenka in their semifinal.
"Not going to lie, I've been waiting for this moment," Swiatek told reporters. "It was pretty hard to see the finish line but still be fully motivated and ready for every match.
"This season has been so intense and I'm so proud of myself that I could play so well until the end. I'm happy it's done."
Swiatek's U.S. Open success saw her became the first woman to capture two Grand Slam titles in a season since Angelique Kerber won the Australian Open and U.S. Open in 2016.
Sabalenka just played better in their semifinal, she said.
"In second set I wanted to kind of overpower her, but in the third I felt it's not my kind of game. I feel like I was playing too risky ... she used her chances and served really well," she added.