The Giants want to keep their options open in left, since Nady must prove that he still can hit big league pitching. He batted only .157 with three home runs and six RBIs in 40 games with the Nationals earlier this year before they released him.
By contrast, Arias entered Saturday hitting .467 (14-for-30) during a nine-game hitting streak. His .417 August batting average led the Major Leagues.
Arias, who played one game in the outfield with the Mets in 2010, took fly balls in left during Saturday's batting practice. Bochy believes that such repetition -- "reading the ball off the bat" -- will enable Arias to acquaint himself sufficiently with playing left, if he's needed there.
If Arias plays left, it won't occur immediately. The right-handed batter has been platooning with Brandon Crawford at shortstop. Since the Giants face left-handed starters Travis Wood of Chicago and Patrick Corbin of Arizona in their next two games. Bochy affirmed that Arias will start at shortstop both days.