SCOTTSDALE, Ariz. -- Every day that goes by, the chances of the Dodgers trading for a starting pitcher seem to increase. Injuries are forcing the issue.On Friday morning, the team announced that Hyun-Jin Ryu was feeling tightness in his left shoulder and is shut down from throwing for now, making him unlikely to be ready at the start of the season.Later Friday night in San Antonio, veteran lefty Erik Bedard, bidding to be the spot starter in Ryu's place, left his game early with triceps tightness.