Great Britain's Harriet Dart scored a massive victory by stunningly defeating 10th seed Daria Kasatkina.

There are big ups and downs in the US Open and this match has also seen a lot of ups and downs.

Because Harriet comes in at world number 88 and Daria Kasatkina is in the top 10 players.

Harriet has defeated a player ranked higher than her for the first time and it is the biggest victory of her life.

With this victory, she has reached the second round of the US Open and this is also her first win in a US Open match. ,

The first set was very thorny but in the second set Daria Nava easily won 6-1 but then Dart won the third set 6-3.

26-year-old Harriet Dart will now take on world number 91 Dalma Galfi of Hungary in her next round.

Harriet reached the third round at the 2019 US Open but has found more success in mixed than singles.