Focus on Federer, Nadal at Wimbledon

Roger Federer insists he hasn't been fretting about when or - perhaps more to the point - if he will win a 17th Grand Slam championship.

"I don't go through days thinking, like, 'My God, I haven't won a Grand Slam in so long,'" Federer said. "It hasn't been that long, to be honest."

Its only long by his remarkable standards; his record-extending 16th major trophy came at the Australian Open in January 2010. That nearly 18-month drought could end at Wimbledon, where Federer already has won six titles, one behind Willie Renshaw (who played in the 1800s) and Pete Sampras.

"It doesn't come in phases; I'm always hungry," Federer said. "And that's a good thing."

Serena Williams' bid for what would be her fifth title at the All England Club, and 14th overall at major tournaments, also was still in play with Week 2 of the grass-court Grand Slam set to begin Monday.

"I'm still alive, and it feels good," said Williams, who could become the first woman since Steffi Graf in 1991-93 to win Wimbledon three years in a row. "You know, I'm hoping to be around - and planning to be around - a lot longer."

As the 125th edition of the tournament heads into the fourth round, all of the principal players are still around, as are the story lines that drew the most interest at the start, from the Williams sisters' comebacks to the dominance of the leading men.

After Sunday's traditional day of rest, action was to resume with all 16 men's and women's fourth-round matches. Two stood out in particular: Top-seeded Rafael Nadal against No. 24 Juan Martin del Potro, and No. 23 Venus Williams against No. 32 Tsvetana Pironkova in a reprise of a 2010 quarterfinal won by the Bulgarian.