Stan Wawrinka wins opening match at Key Biscayne
Serena Williams, Maria Sharapova and Rafael Nadal were among those scheduled to play later Saturday.
![Stan Wawrinka wins opening match at Key Biscayne Stan Wawrinka wins opening match at Key Biscayne](https://www.si.com/.image/c_fill,w_720,ar_16:9,f_auto,q_auto,g_auto/MTY4MTk3MjM4MDE3MTczNDA1/sidamassets140322133132-warinka-cms-single-image-cutjpg.jpg)
![The No. 3-seeded Wawrinka, who won the Australian Open in January, hit 33 winners and improved to 14-1 this year.](https://www.si.com/.image/t_share/MTY4MTk3MjM4MDE3MTczNDA1/sidamassets140322133132-warinka-cms-single-image-cutjpg.jpg)
Serena Williams, Maria Sharapova and Rafael Nadal were among those scheduled to play later Saturday.
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