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Roger Federer is through to his 15th quarter-final in Halle.

Federer's Halle Challenge: Beating Diversity

After a tough win over Mischa Zverev, Roger Federer braces for yet another different game plan against Florian Mayer

The last time Roger Federer and Mischa Zverev played at the Gerry Weber Open in 2013, the Swiss star scored a double bagel victory in the quarter-finals. Their second-round match in Halle on Thursday was far more competitive, but top seed Federer came out on top once again with a 7-6(4), 6-4 win.

Federer improves his FedEx ATP Head2Head record against Zverev to 4-0, including a win this year in the Australian Open quarter-finals. He has yet to drop a set against the German. The Swiss star improves to 56-6 in Halle and 15-0 in second-round matches at this event.

Awaiting Federer in the quarter-finals is another German in defending champion Florian Mayer, who defeated sixth seed Lucas Pouille earlier in the day. Federer leads their FedEx ATP Head2Head series 7-0, including three straight-sets wins in Halle (2005, 2012, 2015).

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Both Federer and Zverev traded service holds throughout the opening set, with the German bravely saving three set points on his serve at 4-5. Little separated them throughout the tie-break, but Federer raised his level when it mattered most at 5/4, flicking two backhand passing shot winners to grab the early advantage.

Their serves continued to be in top form throughout the second set, but it was Zverev who blinked first. Federer laced a forehand passing shot at 4-4 for the lone break of the match and then comfortably held serve to prevail in one hour and 30 minutes.

The eight-time Halle champion didn't face a break point in the contest and finished the day with 28 winners to 18 unforced errors. Zverev hit 18 winners to 23 unforced errors, but the stats aren't a clear indicator of the high level of tennis he produced throughout the match.

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Federer was quick to acknowledge that today’s match bore no resemblance to the double bagel he handed out to Zverev when they met in Halle in 2013.

“It was totally different. He started serving great, which put me under pressure as I wasn’t getting many looks,” Federer said. “It was important to stay calm after missing chances to win the set at 5-4. And it’s important to win ‘breakers. They are the sets you need to win to win tournaments. It felt like a close ‘breaker that could have gone either way.

“After I got that in the bag I was really able to start to relax and really play and feel the way I want to feel out there. That’s the first time I’ve felt like that since Miami, so that’s a good sign looking ahead.”

Although Federer leads Mayer 7-0 in their FedEx ATP Head2Head series, the unorthodox German did push Federer to two tie-breaks when they met on grass in Stuttgart last year. And after combatting very different playing styles in his first two rounds, Federer expects further contrast Friday.

“I played against a right hander from the baseline in Sugita, a left hander who serves and volleys all the time (Zverev) and Mayer plays very different to everyone else. He uses slice, he comes in, he chips and charges, he loops the ball and serves/volleys a little bit, so he’s really going to throw everything at me. I know he wants it badly, so it will be a tough one. I played my best match today and that will give me some confidence for tomorrow.

“I think he’s most dangerous on the grass. He’s a tough customer, plus he’s the defending champion. He hasn’t had the best season so far, so there is a lot riding on the match for him as well as for me because we both want to go deep into this tournament.”

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