Zverev joins Thiem in Hamburg quarterfinals

Alexander Zverev joined top seed Dominic Thiem in the last eight of the German Tennis Championships by beating Federico Delbonis.

Alexander Zverev will face Filip Krajinovic next, at the German Tennis Championships, with the Serbian having beat 2016 champion Martin Klizan 6-7 (6-8) 7-5 6-1.

Alexander Zverev will face Filip Krajinovic next, at the German Tennis Championships, with the Serbian having beat 2016 champion Martin Klizan 6-7 (6-8) 7-5 6-1.   -  Getty Images

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).