GLENDALE, Ariz. >> As the Dodgers awaited the results of an MRI exam on Hyun-Jin Ryu's left shoulder, manager Don Mattingly provided clarity Monday about how often he'll actually need five starting pitchers in April.In short: Not often.Because of some early off days, the Dodgers wouldn't need Ryu until April 13 or 14 against the Seattle Mariners at home, then again April 23 or 24 in San Francisco, Mattingly said.