Caroline Wozniacki of Denmark failed to win a grand slam
last year, but is ranked number one in the WTA Tour singles rankings largely due to the prolonged absence of the former
world number one Serena Williams of the USA.
Williams took grand slams titles in last year at the Australian Open and Wimbledon. The American then however sustained a foot injury which has kept her sidelined since Wimbledon. Williams is expected to rejoin the WTA Tour in March at Miami, Florida.
Leading the WTA Tour rankings for the Americans is Williams at number four and her sister Venus Williams at number five. Venus Williams earlier in 2010 was ranked number two before she suffered a knee injury which has kept her off the tour since the US Open. Williams plans to rejoin the WTA Tour on January 17th at the Australian Open.
Rounding out the rankings for the Americans is Andy Roddick who is ranked 8th in the ATP Tour rankings.
Spain is without a top ten WTA Tour player but has three top ten Spaniards on the ATP Tour. Nadals holds on at number one with David Ferrer and Fernando Verdasco at numbers seven and nine respectively.
For Russia, Vera Zvonareva and Elena Dementieva are ranked number two and nine respectively in the WTA Tour rankings, while Mikhail Youzhny is ranked ten in the ATP Tour rankings. However Dementieva announced her retirement from tennis in October.
Finishing in second place as a nation is Serbia with a total of two top ten ranked players. Jelena Jankovic is ranked 8th in the WTA Tour rankings while Novak Djokovic is ranked 3rd in the ATP Tour rankings.