Manager John Farrell has already seen enough good things from Nava at the position to be comfortable putting him there during a regular-season game.
"He's made the transition in incorporating the position pretty seamlessly. His hands, his feet work fluidly," said Farrell. "The timing of it is good. He's been able to shorten up his arm stroke on the front end of a double play. It's been very encouraging."
Nava's versatility to play the outfield and first base, to go along with his on-base skills, could give him an inside track in the competition for one of Boston's bench spots.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.