After watching Nationals third baseman Ryan Zimmerman make key errors against the Braves on Friday night and Saturday afternoon, an American League scout asked when Zimmerman was moving over to play first base. The scout feels Zimmerman's arm isn't strong enough to play third base any more. In Friday's 6-4 loss to the Braves, the bases were loaded in the ninth inning for Atlanta when Justin Upton hit a grounder to Zimmerman, who went for the force at second, but threw the ball away trying to get Jason Heyward at second base. Two runs ended up scoring and the game was tied at 4. On Saturday, Zimmerman made another key error in the third inning of Washington's 3-1 loss to Atlanta. In that frame, Upton hit a routine ground ball to Zimmerman, who threw the ball past first baseman Adam LaRoche. It should have been the third out of the inning, and it proved costly. The next hitter, Evan Gattis, hit a two-run homer. Zimmerman made his third error of the series Sunday, when his throw drew LaRoche into Ramiro Pena at first base, the slight collision causing the ball to fall from LaRoche's glove, allowing Pena to reach safely. "If you look at [Zimmerman's] throwing, you are going to see a few more errors over there this year," the scout said. "He is struggling over there trying to get it right. After a while, it's going to become a mental situation. Eventually, he's going to have to come off third base." Zimmerman had right shoulder surgery last offseason, and on a scale of 1-to-10, Zimmerman rated his shoulder a 9-plus. "The shoulder is fine. Everything is fine. Everything feels good. Everything is great," Zimmerman said before Sunday's game. "Everyone always asks me how I throw or what I throw. Nobody throws the same and nobody hits the same. It's just how I throw. It's the way it is."