Justine Henin's retirement came as a surprise.

Just 25 years old, Justine Henin decided she no longer could motivate herself emotionally to continue competing. Henin has been in a slump this spring, exacerbated by a nagging knee injury.

Henin leaves behind a wide-ranging legacy of excellence. She won every Grand Slam title but Wimbledon, including four French Opens, two U.S. Opens and the 2004 Australian Open. Henin has been ranked No. 1 for most of the past year-and-a-half.

It's clear that Henin is an all-time great, but where does she rank among the best? We've assembled a list of the greatest women's tennis players of the Open era. Does Henin make your top 5? Cast your vote now!

You must rank at least FIVE to submit your choices.