Roger Federer moved a step closer to winning a ninth Gerry Weber Open title by beating Mischa Zverev to reach the quarter-finals after Kei Nishikori suffered another injury setback just 11 days before Wimbledon gets under way.
Khachanov and Rublev, 19, are both future stars of the game, and it was the former who triumphed 7-6 (10-8) 4-6 6-3 in an entertaining match-up. "And playing against me, all are always very motivated", Federer told the Halle Open website.
The defending champion of this event, Mayer saw his points from that title fly off the board on Monday and with that he plummeted 83 places to No. 134 in the world.
"It will be interesting", Federer said of Zverev. "He started serving great, which put me under pressure as I wasn't getting many looks", Federer told www.atpworldtour.com.
World number five Federer will face Russian 21-year-old Karen Khachanov, the world number 38, in the next round.
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It was his first win against the world number 56 in three attempts and came without a single break point conceded.
Federer, who has yet to drop a set in Halle after losing in Stuttgart in his first match back last week, limited his serve-and-volley game against the German who is a fine returner and Mayer was broken quickly as his opponent won the first set.
"I've played one set against him in practice this week". "He plays a bit different on the serve and the forehand, which is different to the regular forehand technique we see".
Germany's Alexander Zverev prepares to serve to Spain's Roberto Bautista Agut in the quarterfinal of the ATP tournament in Halle, Germany, Friday, June 23, 2017. Big and strong, and super excited to be on the tour, and working hard.