MUNICH — Alexander Zverev of Germany upset top seed David Goffin 6-3, 4-6, 6-3 on Friday to reach the BMW Open semifinals.
The eighth-seeded Zverev fired 10 aces and converted 12 of his 18 break opportunities to prevail over the 13th-ranked Belgian in 2 hours, 22 minutes.
The 19-year-old Zverev - arguably Germany's brightest prospect - next faces the third-seeded Dominic Thiem of Austria, who earlier defeated Ivan Dodig of Croatia 6-4, 4-6, 6-3 at the clay-court tournament.
It will be a fourth semifinal for Zverev, currently ranked a career-best 49th.
Another German, the fourth-seeded Philipp Kohlschreiber, advanced to the other semifinal with a 6-4, 6-1 defeat of wild card Juan Martin del Potro.