![Serena Williams of the U.S. serve speed of 207 km per hour (129 mph) is seen behind Ayumi Morita of Japan during their women's singles match at the Australian Open tennis tournament Serena Williams of the U.S. serve speed of 207 km per hour (129 mph) is seen behind Ayumi Morita of Japan during their women's singles match at the Australian Open tennis tournament](https://c8.alamy.com/comp/2CXARJK/serena-williams-of-the-us-serve-speed-of-207-km-per-hour-129-mph-is-seen-behind-ayumi-morita-of-japan-during-their-womens-singles-match-at-the-australian-open-tennis-tournament-in-melbourne-january-19-2013-reutersdavid-gray-australia-tags-sport-tennis-tpx-images-of-the-day-2CXARJK.jpg)
Serena Williams of the U.S. serve speed of 207 km per hour (129 mph) is seen behind Ayumi Morita of Japan during their women's singles match at the Australian Open tennis tournament
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