CHICAGO -- Chicago Cubs starter Michael Soroka left his first game with his new team with right shoulder discomfort and will require a stint on the injured list, the team announced Monday after its 3-2 loss to the Cincinnati Reds. Soroka, who turned 28 on Monday, felt something grab in his shoulder after throwing a pitch in the second inning. He didn't come out for the third. The Cubs need fresh arms as Soroka was their lone addition to the starting rotation before MLB's trade deadline last Thursday. Ben Brown took over for Soroka on Monday but he has been shaky as the every-fifth-day starter.