Pakistan, July 31 -- The mixed-doubles field at the US Open, which begins next month in New York, will be a star-studded event. The United States Tennis Association announced Tuesday the eight teams receiving direct entries into the tournament, as well as six wild-card entrants. Two more teams will take part as wild cards. Venus Williams, 45, received a wild-card entry and will play with big-serving American Reilly Opelka. The former World No. 1 in singles, Williams is an accomplished doubles player on the biggest stages. She won two Grand Slam mixed-doubles titles in 1998, as well as three Olympic gold medals and 14 Grand Slam women's doubles events with her younger sister, Serena. Venus played on the WTA Tour last week for the first tim...