Matches to Watch: Day 3 Two of Tuesday's matches to watch (Caroline Wozniacki vs. Tamira Paszek and Wayne Odesnik vs. Bjorn Phau) were postponed because of rain and will be completed Wednesday, so there is even more to watch on Day 3 than just the five new matches highlighted here. Players" seeds are in parentheses. Novak Djokovic of Serbia (1) vs. Ryan Harrison of the United States (unseeded), Centre Court Unlike his peers Bernard Tomic and Milos Raonic, Ryan Harrison, 20, has yet to make it to the third round of a Grand Slam tournament. But in his losses to seeded players in the first or second round of each of the last five majors, he has managed to win at least one set each time. His closest loss of the five was last year at Wimbledon against then seventh-seeded David Ferrer, to whom he lost in five sets after having won the first and third frames. Harrison seems ripe for (and perhaps in need of) a defining big run at a Slam sooner rather than later, but his having drawn Djokovic, the defending champion and top seed, in the second round of this one will probably postpone that satisfaction. That said, Harrison has shown himself to handle big stages well, so don't expect Djokovic to be able to wipe the turf with him. Arantxa Rus of the Netherlands (unseeded) vs. Samantha Stosur of Australia (5), No. 1 Court Stosur's weapons (a big serve and a big forehand) might at first glance seem to lend themselves well to grass, but it is actually her worst surface by some distance. The quick court speed doesn't give her as much time to run around her backhand and rushes her long take-backs, and her heavily kicked and spun shots don't bite and bounce up on her opponents like they do on clay or hard courts. Her career record of 6-9 at Wimbledon includes first-round losses the past two years, so in some ways she is probably relieved to have not lost her opening-round match against fellow grassophobe Carla Suarez Navarro. Her second-round opponent Arantxa Rus also prefers slower courts (she made the fourth round of the French Open in May), but her defensive game is not nearly as dampened by the grass as Stosur's is. Maria Sharapova of Russia (1) vs. Tsvetana Pironkova of Bulgaria (unseeded), No. After having won only one match in her first four appearances at Wimbledon, Pironkova suddenly discovered herself as something of a grass master in 2010, reaching the semifinals with a win over Marion Bartoli and a shocking 6-2, 6-3 rout of the five-time champion Venus Williams. Pironkova backed up the run in 2011, reaching the quarterfinals with upsets of No. 2 seed Vera Zvonareva and an identical 6-2, 6-3 win over Williams before losing to the eventual champion Petra Kvitova in three sets. Her game, based largely around low forehand slices and off-speed shots, is by no means typical to grass specialists, but that is part of what makes her so dangerous and unconventional as an opponent. She has had problems with her upper leg in recent days, but she still could prove to be an extremely uncomfortable opponent for the top-seeded Sharapova. Heather Watson of Great Britain (unseeded) vs. Jamie Hampton of the United States (unseeded), No. 2 Court The draw has presented a tremendous opportunity for the 20-year-old Watson and 22-year-old Hampton, who are ranked 103rd and 100th, respectively. Neither has previously made the third round of a Grand Slam tournament. Watson, a Guernsey native who won the girls" singles title at the 2008 U.S. Open, will have the full support and pressure on her side, for better or worse. A win would make her the first British woman to reach the third round of Wimbledon since Elena Baltacha in 2002. Hampton, who upset Daniela Hantuchova in the first round, has considerably less national expectation weighing on her, and is the more offensive-minded of the two. But if it turns into a physical battle, as it well may, Watson is the fitter and quicker of the two. Ernests Gulbis of Latvia (unseeded) vs. Jerzy Janowicz of Poland (qualifier), Court 17 Ernests Gulbis pulled off the biggest first-round upset of the tournament with his straight set ousting of sixth-seeded Tomas Berdych, the only man not named Djokovic, Nadal, Federer, or Roddick to have made the finals of this tournament since 2003. This second-round encounter against Janowicz, a big-serving Polish qualifier, represents something of a trap match for Gulbis; his court assignment has been demoted all the way from Centre Court to No. 17, and his foe is ranked more than 100 spots lower than his previous opponent. Though he has always been known to be able to play well in flashes, Gulbis has hardly been known for consistently playing well in his career. An emphatic win in this match could signal a turning point perhaps just as much as the booming win over Berdych did.