In a lopsided final, the Polish star did not lose a single game against the 2019 Rome champion to wrap up the match in just 46 minutes.
Pliskova will play reigning Roland Garros champion Iga Swiatek for the title in Rome.
Pliskova rallied from a set down to beat Gauff; No.11 seed Jennifer Brady had it easy against Venus Williams.
The World No.1 beat Aryna Sabalenka to bag her third title of the season and 11th career WTA singles title
Sixth seed Karolina Pliskova came from a set-down against Jelena Ostapenko to reach the quarterfinals in Stuttgart
Serena Williams is the legend of women’s tennis but there are a lot of players who are rising up the ranks and dominating the sport.