HAMBURG: Top seed Alexander Zverev shrugged off a knee issue to ease past Jesper de Jong in straight sets and into the last 16 at his home tournament in Hamburg on Wednesday.

The defending champion hurt his left knee in a fall at Wimbledon but advanced 6-2, 6-2 past 114th-ranked Dutchman De Jong to set up a meeting with France’s Hugo Gaston in the pre-Olympic clay-court tournament.

“I was still unsure this morning if I was going to play or not and during the warm-up I was in quite a lot of pain,” said the German world number four.

“But somehow when I step on this court it disappears a little bit when the adrenaline gets going.

“I have an injury where I know where I stand and it will take time to heal. It won’t heal in the next few days, it will take weeks and it’s up to me if I am going to play like that or not.”

Nadal eyes Olympics but not Wimbledon after likely French Open farewell

Zverev, who reached the fourth round on grass at Wimbledon, claimed his 41st match win of the season.

Third seed Sebastian Baez and fourth-seeded Francisco Cerundolo, both from Argentina, reached the quarter-finals Wednesday along with Italy’s Luciano Darderi and Spaniard Pedro Martinez.