WIMBLEDON, England -- Because of the rain, the player who gets through might end up playing nearly every day. So fitness, more than ever will come into play.
"I know, especially now, if I keep winning, it's going to be almost like every day," Jennifer Capriati said. "I've played every day already. That's usually not what happens in a Grand Slam."
Plus there are the delays to deal with.
"You sit around," Capriati said, "you start to get a little bit -- it's hard to not just get sluggish and just kind of, you know, lose that quickness. That's one of the toughest things."
Capriati, who is seeded seventh, will be playing No. 10 seed Nadia Petrova of Russia in the fourth round on Tuesday.
If Capriati wins, she'll most likely meet Serena Williams, who was asked to assess her most recent nemesis' attitude on Sunday.
"She's really excited about life," Serena said. "I think she's really happy to be doing so well in her career still. I just always see her really more optimistic about things."
Serena didn't know who her fourth-round opponent was until Monday when Tathiana Golovin defeated Emmanuelle Gagliardi.
Here's a look at Monday's matchups.
Former champion Lleyton Hewitt plays former No. 1 Carlos Moya, who has never been past the fourth round at Wimbledon. Despite that, he rented a flat for two weeks at Wimbledon rather than getting a hotel in the city as many other clay-court players routinely do.
Hewitt, usually more known as a counter-puncher, has not dropped his serve in 40 consecutive games. Moya will be the first right-hander Hewitt has faced in the tournament.
If Moya wins, he'll be the first Spaniard to reach the Wimbledon quarterfinals since 1972. Only two have ever reached the quarters in the Open Era (1968): Andres Gimeno (1970) and Manuel Orantes (1972).
Roger Federer plays the man who ousted Hewitt in the first round last year, Ivo Karlovic. Federer, who has a 20-match win streak on grass, also has not dropped his serve as he's won 37 consecutive service games. Karlovic has played 29 consecutive tiebreaks in 2004.
These two have never met before, so it will be interesting to see how Federer reacts to the tallest player on tour at 6-foot-10. In three matches so far, Karlovic has served 95 aces.
Andy Roddick plays unseeded German Alexander Popp. Roddick has never lost in the fourth round of a major. Popp has advanced to the quarterfinals in every appearance at Wimbledon.
Lindsay Davenport plays Vera Zvonareva, who in three meetings has not won once. Davenport has been struggling with a knee injury, but she's dropped only six games here so far as she's quietly advanced.
Tim Henman of Britain plays Aussie Mark Philippoussis, who has the head-to-head edge 4-2. Henman won their last meeting on hard court in 2002 at Adelaide.
Amy Frazier, 31, is the oldest woman remaining in the tournament while Maria Sharapova at 17 is the second youngest. It was here in the fourth round last year that Sharapova had her first success in a major. Sharapova holds a 2-0 record against Frazier.
American Vince Spadea plays Sjeng Schalken in a match Schalken recommended bringing a picnic for. The two have split their six previous meetings. They've never before met on grass.
Cynthia Faulkner is the tennis editor for ESPN.com.