
Serena Williams' clash with sister Venus highlighted fourth round play at Wimbledon on Monday.

It was their 26th meeting overall and first at a major since 2009. Given their accomplishments -- five titles apiece at Wimbledon -- the match took place on Center Court.

The match itself wasn't that close. Serena beat Venus in straight sets, showing little of the uncertainty that plagued her play Friday against Heather Watson.

Nick Kyrgios continued to make headlines. He received a warning for an audible obscenity and appeared to tank in one game in the second set against Richard Gasquet.

Kyrgios, however, can certainly play and his shot-making can be breathtaking. Here he exchanges shots at the net with Gasquet.

Gasquet lost to Kyrgios last year at Wimbledon after holding nine match points. But he won in four sets Monday to reach the quarterfinals and send Kyrgios packing.

Andy Murray is pumping his fist and why not? He overcame the big serves of Ivo Karlovic in four sets and the 2013 champion next plays Canada's Vasek Pospisil.

Maria Sharapova won the tournament 11 years ago -- but hasn't done so since. However she has yet to drop a set after cruising past Zarina Diyas.

Caroline Wozniacki, left, is out, though. Garbine Muguruza, who has a history of pulling off upsets at majors despite her young age, advanced in two sets.

Could Stan Wawrinka complete the French Open-Wimbledon double? No one is counting him out. Wawrinka is one of those who hasn't dropped a set, either. He dispatched David Goffin on Monday.