Zverev edges past Harris to reach Cologne Open semi-finals; Rublev advances to last four at St Petersburg open
Hard-serving American Reilly Opelka, who beat defending champion Daniil Medvedev at St Petersburg Open on Thursday, was beaten by the seventh-seeded Borna Coric 7-6 (3), 6-3 in their quarterfinal.
Top seed Alexander Zverev edged out South African qualifier Lloyd Harris 6-4, 3-6, 6-0 to reach the Cologne ATP semi-finals on Friday.
Zverev, the world number seven and US Open runner-up, made the most of Harris struggling with a leg injury in the final set.
"I have got to do a better job of keeping my focus until the end of a match. I relaxed a little bit and then he picked up his game," Zverev told atptour.com.
Zverev is through to his third semi-final of the year where he will face Alejandro Davidovich Fokina.
The Spaniard battled past Dennis Novak of Austria 6-3, 2-6, 6-3 to reach his second ATP Tour semi-final.
Canada's Felix Auger-Aliassime defeated Radu Albot 6-3, 6-0 to reach the last-four.
The third seed now faces Spanish fourth seed Roberto Bautista Agut who downed Poland's Hubert Hurkacz 7-6 (7/4), 5-7, 6-0.
Rublev, Shapovalov, Coric, Raonic reach St Petersburg semis
Andrey Rublev eased into the semifinals of the St Petersburg Open after defeating Britain’s Cameron Norrie 6-2, 6-1.
The third-seeded Russian will play Denis Shapovalov for a place in Sunday’s final. Second-seeded Shapovalov defeated Stan Wawrinka 6-4, 7-5.
Hard-serving American Reilly Opelka, who beat defending champion Daniil Medvedev on Thursday, was beaten by the seventh-seeded Borna Coric 7-6 (3), 6-3 in their quarterfinal.
Coric next faces 2015 champion Milos Raonic, who overcame the fourth-seeded Karen Khachanov 6-1, 7-6 (1).
Indian Wells 2021: Taylor Fritz stuns Alexander Zverev in quarter-finals, Tsitsipas loses to Basilashvili
The exits of Zverev and Tsitsipas means Great Britain's Cameron Norrie, who is seeded 21st, is the top seed left in the final four.
Sunday's final will be the first meeting between Jannik Sinner and Diego Schwartzman.
Dimitrov will face Polish eighth seed Hubert Hurkacz, who rolled over Russian Aslan Karatsev 6-1, 6-3 earlier on Wednesday, in the quarter-finals.