Kim Clijsters has come back from two years out of tennis to win the women's singles at the US Open in New York.
The Belgian player - unseeded but a former world number one - beat Caroline Wozniacki of Denmark 7-5 6-3.
After winning, the tennis champ told crowds at the New York stadium that winning hadn't been the plan.
"I can't believe this happened. It still seems so surreal that in my third tournament back I won my second Grand Slam."
It was a very proud moment for her husband and 18-month old daughter Jada, who were watching the match from the stands.
Kim Clijsters left tennis two years ago to get married and have a baby.
The 26-year-old has only been back in the game for five weeks.
After two warm-up events last month, she received a wildcard entry into the US Open and took advantage to the fullest.
In the men's final, Roger Federer will be on court today, hoping to prove that dads can be the best in the world too!
He has already won the title five times in a row.
Success for British girls
In the girls game, there was success for Heather Watson. The 17-year-old became the first ever Brit to win the US Open girls' singles title.
She beat Russia's Yana Buchina 6-4, 6-1.
But there isn't much time to celebrate - she is already back to school in Florida, America.
The tennis champ has been living there since the age of 12 and spends half a day playing tennis and the other half at school.
Watson will only be in school for a week, however, before she gets back on the road. She is due to play a tournament in Canada before heading to Britain to play the Aegon Pro-Series event in Barnstaple, Devon.