Tennis champ Andy Roddick will marry his fiancée, Sports Illustrated swimsuit model Brooklyn Decker, this weekend, a source confirms to PEOPLE. Roddick, 26, and Decker, 21, plan to celebrate the nuptials with two days of festivities near Roddick's Austin, Texas, home. "They wanted to keep it local," the source says. And very private. The pared-down guest lists includes mostly family and a few close friends of the pair, who met when Roddick spotted Decker in a magazine and asked his agent to find her number.