Alexander Zverev made home advantage count as he battled through to the quarter-finals of the German Tennis Championships with a straight-sets win over Federico Delbonis.
After a shock first-round exit at Wimbledon, world number five Zverev - featuring in the tournament in his hometown for the first time since 2016 - has rediscovered his form on clay.
He had to overcome a resilient opponent in Delbonis in humid conditions on Thursday, coming out on top 6-4, 7-6 (7-2) to join world number four and top seed Dominic Thiem in the last eight.
Zverev will face Filip Krajinovic next, with the Serbian having beat 2016 champion Martin Klizan 6-7 (6-8), 7-5, 6-1.
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Seventh seed Jan-Lennard Struff suffered a surprise defeat to Pablo Carreno Busta, who will meet Fabio Fognini next after the Italian beat Rudolf Molleker 7-5, 6-4.
Meanwhile, the seeded players also dominated in the Swiss Open Gstaad - Roberto Bautista Agut, Dusan Lajovic, Joao Sousa and Pablo Andujar all progressing to the quarterfinals.
Bautista Agut, a runner-up at the tournament last year, saw off compatriot Jaume Munar 7-6 (9-7), 6-4, while third seed Lajovic required three sets to edge past Denis Istomin.
Sousa found victory easier to come by against Gian Marco Moroni, while Andujar saw off a second-set fightback from Taro Daniel to triumph 6-1, 3-6, 7-6 (7-2).
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