Seven-time Wimbledon champion Roger Federer is looking increasingly untouchable at the All England Club after making the quarter-finals without being broken and boasting a remarkable serving sequence. The 33-year-old reached his 13th quarter-final at the All England Club on Monday with a 6-2, 6-2, 6-3 win over Spain's Roberto Bautista Agut. His 96-minute win meant that in four rounds he has yet to drop his serve. He has faced just two break points in 58 service games and committed only three double faults as he continues his quest for a record eighth Wimbledon title and the honour of being the oldest champion at the tournament in the Open Era. The last time he dropped serve was in the second set of his opening round win over Philipp Kohlschreiber in Halle - more than 100 service games ago. "Maybe the guys are returning terrible," joked Federer. "I got things figured out at the moment. Clearly having the extra week (between the French Open and Wimbledon) helped me be perfectly prepared for Wimbledon. "So I think there were fewer question marks going into this tournament. In Halle I could have easily lost in the first round. I was down 5/4 in the tiebreaker. Fast conditions, late at night, slippery. I was lucky to get through that one." "Once I got through that one, I really was able to feel better, serve more consistent. Just focusing, point per point. Especially on grass, that's what it takes. I did a good job."