Big guns progress, Murray out
Roger Federer and Novak Djokovic won through to the quarter-finals of the Western & Southern Open - but Andy Murray slipped up in Cincinnati.
Federer beat Bernard Tomic 6-2 6-4 to set up a clash against Mardy Fish and was pleased with how things went, with the US Open now very much in the minds of players.
The Swiss told www.atptour.com: "I was able to mix it up well and not have too many hiccups on my own serve.
"Then I was able to create some opportunities and take advantage of that and get the win."
Djokovic was on the court for only 30 minutes, winning the first set of his match against Nikolay Davydenko 6-0 before the Russian withdrew because of a shoulder injury.
However, Olympic gold medalist Murray was brought back down to earth with a bump, suffering a shock defeat at the hands of unseeded Frenchman Jeremy Chardy .
Murray had beaten the world number 38 in all of their four previous encounters but looked out of sorts on his own serve and was subsequently punished in a 6-4 6-4 loss.
Fish set up his clash with Federer with an overdue 6-3 6-3 win against Radek Stepanek, while Juan Martin del Potro beat Viktor Troicki 7-6 (7/2) 2-6 6-1.
Marin Cilic reached the last eight with a 7-6 (7-4) 6-2 defeat of Pablo Andujar and Stanislas Wawrinka joined him after knocking out Kei Nishikori 6-3 6-3.
In the women's event, the Williams sisters progressed with straight sets wins.
Serena won her 19th successive match by beating Urszula Radwanska 6-4 6-3, while Venus had few problems seeing off Sara Errani 6-3 6-0.
Top seed Agnieszka Radwanska did not have things all her own way before seeing off Sloane Stephens 6-1 4-6 6-4 - but Sam Stosur's 6-1 6-3 win over Ekaterina Makarova was more convincing.
Elsewhere. Angelique Kerber defeated Andrea Hlavackova 6-4 7-6 (7/5) and Petra Kvitova knocked out Peng Shuai 6-2 6-2.