Tanner Roark will start Game 4 of the National League Division Series against the Cubs, though almost everyone knew that by the time Nationals Manager Dusty Baker finally said it Sunday afternoon. Roark was really the only option for Tuesday’s game. The Nationals could have brought back Stephen Strasburg on three days’ rest, then banked on Gio Gonzalez in Game 5. That scenario always seemed unlikely. The Nationals have never used Strasburg on three days’ rest. Given his health history, they almost certainly never would. Rain is in the forecast for Tuesday, and that could change things, since Strasburg would then be available for Game 4 on regular rest. But if everything stays on schedule, Roark is the obvious choice. “If he’s needed [in Game 3], to play an extra-inning game, then you have to make an adjustment from there,” Baker said Sunday. “… But [Game 4] is our plan because he’s going to throw a bullpen today.” The right-hander is a native of Wilmington, Ill., a little over an hour from Chicago, which means blocks of his family and friends have packed the Wrigley Field stands for his four career starts here. Roark has a 3.24 ERA in 25 innings at Wrigley Field.