WIMBLEDON, England – After curling in a 102 mph ace to grab a two-set lead a mere 56 minutes into his Wimbledon quarterfinal Wednesday, Roger Federer casually pulled an extra tennis ball from his pocket and strolled to sit in his changeover chair for a sip to drink.

No fist pump. No yell of excitement. No energized jog to the sideline.

There still was work to be done; nothing to be taken for granted. Motivated by the bitter memory of quarterfinal losses at the All England Club the past two years, including a wasted two-set edge in 2011, six-time Wimbledon champion Federer bullied 26th-seeded Mikhail Youzhny of Russia, 6-1, 6-2, 6-2, to reach his record 32nd career Grand Slam semifinal.