Karolina Pliskova today defeated world number 1, Serena Williams in the semi-finals of the US open grand slam. She beat Serena 6 2:7 5.
Karolina had previously in the slam defeated the older Williams, Venus in the Round of 16 and today did same in the semis with Williams.
She is the first Czech woman to reach the semi final of the US Open and this is her biggest career win and first ever grand slam finals. She is 24 and was only 7 years when Serena worn her first grand slam in 1999.