The meeting lasted 1 hour 16 minutes and ended with a score of 6: 2, 6: 4 in favor of the Russian tennis player, who completed one ace, realized five break points out of seven and made three double faults.
This match was the second for both semi-finalists of the day.
Before they played their quarterfinal games.
In the final, Kasatkina's rival will be the representative of Tunisia Ons Jaber.
The match will take place on June 20.
Earlier it was reported that Samsonova defeated Azarenka and reached the final of the WTA tournament in Berlin.