NEW YORK -- Red Sox outfielder Bobby Kielty said he is scheduled to undergo X-rays and perhaps other tests to determine the cause of continuing back pain, the result, he said, of colliding with the low bullpen wall in right field at Fenway Park in his first game with the team 10 days ago. "I woke up and it's been contracting the whole day, spasming," Kielty said. "I wasn't in the lineup, so ...