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The German announced her retirement after 15 years on the WTA tour.

The Roland Garros champion's short career has been nothing short of fascinating.

With the French Open in full swing, see what you know about the Major's unique surface.

Test your knowledge of the No. 1 seed's accomplishments in Paris.

The Spaniard's memorable journey through the Masters 1000 tournament has lasted 15 years.

Test your knowledge of the unprecedented changes to this year's tournament.

The twins have officially retired, ending their careers as the greatest team of all time.

Test your knowledge on the American's history at the Western & Southern Open.

The Williams sisters have faced each other across four decades.

Test your knowledge of the Brit at the American Grand Slam.

The inaugural edition of the event broke all tennis rules; now it's going further.

Test your knowledge on the undisputed greatest Bulgarian player in history.

See how much you know about the American's history at her home Slam.

How much do you know about the enigmatic Aussie?