The Washington Nationals have announced the call-up of top prospect Anthony Rendon as third baseman Ryan Zimmerman heads to the 15-day disabled list with a sore left hamstring. Zimmerman had an MRI before the Nats' win over the Mets on Saturday afternoon. Rendon will make his major league debut after playing just 57 minor league games over the last two seasons. He was selected by the Nationals with the sixth pick overall in the 2011 MLB Draft out of Rice University. The 22-year-old was hitting .292 with 2 HR and 7 RBI through 14 games with the Double-A Harrisburg Senators this season.