Dodgers ace Clayton Kershaw showed some progress while playing catch before Sunday's game against the Kansas City Royals, but Los Angeles manager Dave Roberts remains uncertain whether the three-time Cy Young winner will make his next start. In fact, Roberts said that Kershaw could start Monday against Pittsburgh, push his start back a couple of days or even go on the injured list with some tenderness in his shoulder that he first felt after last week's outing against Colorado. "I just don't want to say right now," Roberts said after watching Kershaw's session in the Kauffman Stadium outfield.