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Retired tennis pro John Isner participates in Napa County tennis clinic

Vern Glenn reports on a tennis clinic in St. Helena that was attended by retired tennis pro John Isner. Website: http://kpix.com/ YouTube: http://www.youtube.com/CBSSanFrancisco Facebook: https://www.facebook.com/CBSSanFrancisco Instagram: https://www.instagram.com/kpixtv/ Twitter: https://twitter.com/KPIXtv
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