American tennis star Serena Williams hopes to complete the Grand Slam of tennis at the U.S. Open next week in Flushing Meadows, New York. She’s armed with victories this year at Wimbledon, the French Open and the Australian Open. So far, world tennis action on the men’s side has been dominated by foreign players. But a high school graduate from Johnson County is hoping to change that. KPR’s Greg Echlin has more on Jack Sock, the up-and-coming player who grew up in Leawood.