ATLANTA — If this was an audition for a permanent spot in the Braves rotation, Williams Perez nailed it. Perez gave up one run over five innings and had seven strikeouts in his first major league start and fellow rookie Todd Cunningham drove in the tiebreaking run with a groundout as Atlanta beat the Tampa Bay Rays 2-1 on Wednesday night. “He was terrific,” said Braves manager Fredi Gonzalez.