CNN  —  Nerves were rarely an issue for Steffi Graf during her decorated tennis career, even though she found herself playing on the sport’s biggest stages time and again. “I did something that I was so comfortable with, that I’ve done all my life,” Graf, who won 22 grand slam singles titles and spent a women’s record 377 weeks as the world No. 1, tells CNN Sport . “I knew all the ins and outs.” So it was perhaps a surprise, 25 years after retiring from tennis, that Graf found herself suddenly

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