Top seed Serena Williams reached the second round by beating Stefanie Voegele of Switzerland 7-6 (2), 6-2.
Williams, who won the title at Roland Garros in 2002 after defeating her sister Venus, fired 10 aces and three service winners late in the tiebreaker.
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The 12-time Grand Slam champion also saved three break points late in the first set.
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