Djokovic, Federer sail through; Serena exits
World number two Novak Djokovic has a shot at revenge against Juan Martin del Potro, who ended the Serb's medal hopes at the London Olympics, when the two are set to clash in the Cincinnati Open semifinals on Saturday.
World number one Roger Federer, who dealt with American Mardy Fish 6-3, 7-6 in some style, will play his Swiss Davis Cup team-mate Stanislas Wawrinka in the other semi.
Djokovic, who lost to former US Open winner Del Potro in the Olympic bronze medal match less than two weeks ago, enjoyed a routine 6-3, 6-2 victory over 12th seeded Croatian Marin Cilic on Friday to advance.
Del Potro overcame the surprise player of the tournament, Frenchman Jeremy Chardy, who entered the draw as a lucky loser and reached the quarterfinals thanks to wins over American Andy Roddick and Olympic champion Andy Murray. The Argentine needed 76 minutes to make sure Chardy's run stopped, surrendering only 12 points on serve and breaking him four times in a 6-1, 6-3 rout.
Wawrinka, ranked 26th in the world, beat big-serving Canadian Milos Raonic 2-6, 7-6, 6-4.
Olympic champion Serena Williams suffered her first loss in nearly three months on Friday as she was knocked out of the quarterfinals, falling 6-4, 6-4 to Germany's Angelique Kerber.
While older sister Venus Williams continued her progress and moved through to the semifinals with a 6-2, 6-7, 6-4 win over US Open champion Samantha Stosur, Serena struggled against an impressive Kerber en route to just her fourth defeat of the year. Top seed Agnieszka Radwanska of Poland, struggling with a sore shoulder, was beaten 6-1, 6-1 by ninth-seed Li Na of China.
Serena, who had not lost since her opening round defeat at the French Open, complained of fatigue after her last 16 match on Thursday but she fell on Friday to an opponent.
Bop-Hesh in semis
Mahesh Bhupathi and Rohan Bopanna reached the semifinals with a hard-earned win over third seeds Mariusz Fyrstenberg and Marcin Matkowski.
The sixth seed Indian pair recorded a 6-4, 3-6, 10-8 win over the Polish pair.