Federer forced to dig deep
Roger Federer had to fight through a final set tie-break to beat Milos Raonic and kick off his clay-court season with a win at the Madrid Open.
Federer, who had not played since a surprise early loss to Andy Roddick in Miami in March, came through 4-6 7-5 7-6 (7/4) against Raonic, a recent winner over Andy Murray in Barcelona.
Raonic had seized on his solitary break point chance to take the first set, but Federer responded by breaking in the 12th game of the second to force the decider. After it went with serve all the way, Federer edged through the tie-break to victory.
Second seed Rafael Nadal enjoyed a much easier passage to the third round as he broke Russian Nikolay Davydenko four times on his way to a 6-2 6-2 victory in 80 minutes.
Nadal, twice a previous winner of this tournament and the losing finalist to top seed Novak Djokovic last year, is aiming for a third straight clay court title after his wins in Monte Carlo and Barcelona.
Nadal told atptour.com: "I played much better than I expected. I am very happy to be in the third round and tomorrow I will probably have a very difficult match against (Fernando) Verdasco."
Fellow Spaniard Verdasco, seeded 15th, beat Colombian qualifier Alejandro Falla 6-7 (4/7) 6-4 6-4 but will be up against it against Nadal, whom he has never beaten in their 13 previous meetings.
Fourth seed Jo-Wilfried Tsonga advanced with a 6-2 7-6 (7/4) win over American wild-card Ryan Harrison, while fifth seed David Ferrer defeated Czech veteran Radek Stepanek 7-6 (7/4) 6-2.
Seventh seed Janko Tipsarevic saw off Argentinian qualifier Federico Delbonis 7-6 (7/5) 6-7 (6/8) 6-3 but eighth seed John Isner was the biggest casualty of the day as he fell 7-6 (7/4) 7-6 (7/3) to Croatia's Marin Cilic.
Other men's winners were 10th seed Juan Martin Del Potro, who beat Mikhail Youzhny 6-4 7-6 (7/1), plus Gael Monfils, Alexandr Dolgopolov, Nicolas Almagro, Richard Gasquet, Stanislas Wawrinka and Gilles Simon.
In the women's event, Wimbledon champion and third seed Petra Kvitova was sent crashing out by fellow Czech and qualifier Lucie Hradecka, the world number 105 winning 6-4 6-3 in just 71 minutes.
Also in round two, fourth seed Agnieszka Radwanska hammered Italy's Sara Errani 6-0 6-1, Roberta Vinci saw off Belgium's Yanina Wickmayer 6-1 6-2, and Elena Makarova beat 16th seed Maria Kirilenko 6-4 6-4.
In third-round action, world number one and top seed Victoria Azarenka broke opponent Ana Ivanovic twice in each set and despite dropping serve twice herself, won through 6-4 6-4.
Fifth seed Sam Stosur beat unseeded Petra Cetkovska of the Czech Republic 6-3 6-2, while eighth seed and French Open champion Na Li pushed past Germany's Angelique Kerber 7-5 6-4.