SAN DIEGO — Melvin Upton Jr. hit two two-run home runs against his former team and Yangervis Solarte hit a three-run shot to back James Shields and give the San Diego Padres a 9-0 victory over the Atlanta Braves on Tuesday night. Upton, acquired from the Braves in a seven-player trade the day before the season opened, homered in the sixth inning off David Aardsma and in the eighth off Andrew McKirahan to help Shields with a much-needed laugher. Upton, who has five homers this season, was a late addition to the starting lineup after Will Venable was traded to Texas a few hours before the game.