Fontana will start at second base and bat eighth Sunday against the Marlins.
Since being called up to the big leagues Monday, Fontana has recorded only one hit in 11 at-bats, but he'll still benefit from his second start in a row with everyday second baseman Danny Espinosa in the midst of an extended slump. Once either Fontana or Espinosa is able to find some success at the plate, that player could end up taking on the bulk of the starts at the keystone.