 He was traded by the Padres to the Houston Astros for Derrel Thomas, Bill Greif, and Mark Schaeffer on December 3, 1971.His being traded by the Padres was just prior to the Padres signing another Dave Roberts ("see" below), who joined the club in 1972.If this trade had not occurred, the Padres roster would have featured two unrelated players named "Dave Roberts", making this among the few occasions where a team's roster featured two unrelated players with the same name.