Atlanta Braves catcher Sean Murphy has a cracked rib and is expected to miss four to six weeks, the team said on Monday. The injury gives top prospect Drake Baldwin the chance to start the season as the starting catcher.

The Braves said the timetable is four to six weeks for Murphy’s return. A year ago, Murphy strained his oblique on Opening Day and missed two months. D’Arnaud stepped back into the primary role with Tromp as his backup while Murphy was out. Baldwin was in Double A at the time.