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WTA on Instagram: “September 10, 1988! Steffi Graf wins the #USOpen to complete the Calendar Grand Slam!” | Steffi graf, Beautiful athletes, Softball training
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Steffi Graf (GER) competing at the 1988 Olympic Summer Games in the year she won the Golden Slam Stock Photo - Alamy
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Forget Calendar Slam, 'Surface Slam' Almost as Rare | Bleacher Report | Latest News, Videos and Highlights
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