The New York Mets have placed Taijuan Walker on the injured list with tightness in his left side.

Walker lasted just three innings in his start against the Atlanta Braves earlier this week.

On Tuesday, the Mets said Walker's MRI showed no structural problem. Luis Rojas said the Mets "want to see the mechanics" when Walker pitches. Rojas said Walker's difficulty may be related to his windup and delivery.