I expect a pretty tough match here and thus expect to see more 22 games played. Both Kvitova and Kerber are left-handed, and Kerber has had some troubles at the beginning of the tournament. She looked nervous, but then improved her game a lot and got a clear win against Carla Suarez Navarro in the quarter-final.
Kvitova surprisingly defeated Garbine Muguruza and has been extremely accurate on her way to the semis. Both girls will be well prepared here and ready to fight til the end in the upcoming match. Kerber must defend her rating, so maybe she will be more edgy.