Paul David Serna is a former professional baseball infielder. He played two seasons in Major League Baseball for the Seattle Mariners.Serna was signed as an amateur free agent by Seattle in June of 1980, and by the following September he was in the major leagues. Playing mostly shortstop down the stretch, Serna batted .255 with 4 home runs in 30 games. That earned him a shot the following year, and he spent the whole 1982 season in Seattle as a utility infielder.