No. 1 Nikolay Davydenko
The current 11th-ranked 28 years old Russian player in the world is probably better known for being a target of a match-fixing investigation in 2007, even though he was eventually cleared. Best Grand Slam finish since 2005: Made the semifinals in the French and U.S. Opens in 2007.
No. 1 Elena Dementieva
The fourth-ranked 27years old Russian won the singles gold medal at the 2008 Olympic Games in Beijing. Best Grand Slam finish since 2005: In the last two years she's made the semis at Wimbledon and the U.S. and Australian Opens. In 2004 she made the finals of the French and U.S. Opens.
No. 2 Tommy Robredo
27 years old Spain player Ranked 17th in the world, plays in the long shadow cast by his countryman, 23-year-old Rafael Nadal. Best Grand Slam finish since 2005: He's made the quarterfinals of the French Open three times in the last five years (including this year).
No. 2 Dinara Safina
The 23 years old Russian current No. 1 player in the world is the younger sister of two-time slam winner Marat Safin. She's currently in the semifinals of the French Open. Best Grand Slam finish since 2005: She made the finals of the 2008 French Open and the 2009 Australian Open, losing in straight sets both times.
No. 3 David Nalbandian
The 27 years old Argentina @ 15th-ranked Nalbandian is one of only five active players who has made at least the semifinals in all four slams. Best Grand Slam finish since 2005: Made the semifinals at the 2006 Australian and French Opens. He's been sliding a bit in the slams lately, with his best finish being the fourth round at the 2008 Australian and U.S. Opens.
No. 3 Jelena Jankovic
The 24 years old Serbian ranked fifth player in the world, Jankovic holds the distinction of being the only player ever to finish a year at number one on the WTA rankings (2008) without ever having won a Grand Slam event. Best Grand Slam finish since 2005: She lost in the finals of last year's U.S. Open to Serena Williams.
No. 4 Fernando Gonzalez
The 28 years old Chile player Ranked No. 12 in the world, nicknamed "Mano de Piedra" (Stone Hand), for his ferocious forehand. Made the French Open semifinals. Best Grand Slam finish since 2005: Lost the 2007 Australian Open final to Roger Federer in straight sets.
No. 4 Nadia Petrova
The 26 years old Russia player Ranked No. 11 in the world, has won nine singles titles on the WTA Tour. Best Grand Slam finish since 2005: Made the semifinals in the 2005 French Open.
No. 5 David Ferrer
The 27 years old Spain player Ranked #14 in the world, Ferrer has won seven worldwide tournaments.Best Grand Slam finish since 2005: He made the semifinals in the 2007 U.S. Open.
No. 5 Patty Schnyder
The 30 years old Switzerland player Ranked 17th in the world, Schnyder is ancient in women's tennis terms. She's had subpar results in slams this year, exiting in the second round at the Australian and the first round at the French.Best Grand Slam finish since 2005: She's made the quarterfinals in the French and US Opens and Australian (twice).