07:40 PM ET 04.21 | In wake of placing Ryan Zimmerman on the disabled list, the Washington Nationals have called up top prospect Anthony Rendon to take over at the hot corner. Chad Tracy had been filling in over the last few games. Zimmerman has missed the last few games dealing with an apparent hamstring injury. The fact that Zimmerman is injured may shed some light on his the reason behind his recent struggles on defense, however Zimmerman insisted that the mistakes have all been mental. While Zimmerman has been invaluable to the Nationals since 2005, it's certainly exciting to see Rendon get a shot. Many have drawn parallels from Rendon to fellow Nationals player Bryce Harper, who also received his call to the big leagues in late April because of a Ryan Zimmerman injury.