Stuttgart - Feliciano Lopez upset Tomas Berdych 6-7 (7/4), 6-3, 6-4 and Mischa Zverev ended veteran Tommy Haas' participation in the Stuttgart Open quarter-finals on Friday.
Lopez saved all nine break points he faced against the third-seeded Berdych.
Zverev defeated Haas 6-4, 6-4 for a semi-final against Lopez.
The 39-year-old Haas, who defeated Roger Federer in the second round on Wednesday, was playing for the last time at the grass-court tournament.
Zverev says, "I'm a bit sorry, especially because I could always hear his daughter, who shouted, 'Come on, Daddy!' They're special moments. He's a champion."
Also, the fourth-seeded Lucas Pouille defeated Philipp Kohlschreiber 6-4, 2-6, 6-3.
Pouille next faces Benoit Paire or Jerzy Janowicz in the other semi-final.
Results from the ATP tournament in Stuttgart on Friday (x denotes seeding):
Mischa Zverev (GER x6) bt Tommy Haas (GER) 6-4, 6-4
Feliciano Lopez (ESP) bt Tomas Berdych (CZE x3) 6-7 (4/7), 6-3, 6-4
Lucas Pouille (FRA x4) bt Philipp Kohlschreiber (GER) 6-4, 2-6, 6-2
Benot Paire (FRA) bt Jerzy Janowicz (POL) 6-1, 7-6 (7/4)