Tennis legend Steffi Graf turned 50 on Friday. The tennis world took to social media to wish the 22-time Grand Slam champion a happy birthday.

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Graf , who retired in 1999, is married to fellow tennis legend Andre Agassi. In 1987, the now-mother of two made history by winning a Golden Slam—all four Grand Slams plus Olympic gold in the same year. No player has achieved the feat since then.