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This year that honor belongs to Kim Clijsters (and deservedly so).
Congratulations!. I think I speak for every tennis fanatic when I say it's good to have you back Kim! =).
Source: laureus.com2010 Laureus World Comeback of the Year Award – Kim Clijsters
"2009 was a very emotional year for me. At the start I lost my father, and then winning the US Open was an unbelievable emotion. It was an experience I never thought would happen so quickly and so soon.
"It was an amazing two weeks. I'm really happy that I decided to come back to tennis, and that I have my family who like to travel and live this adventure with me. Now that Justine Henin and myself are back, I think I've started a trend with ex-tennis players making a return. I think it is only good for the sport."