Nunez, a third baseman ranked by MLB.com as the club's No. 6 prospect, entered the day batting .272 with 12 home runs and 39 RBIs through 65 games for Class A Advanced Stockton.
He was signed by the A's in 2010 for $2.2 million out of Venezuela.
The Futures Game, slated for 2 p.m. PT, will be featured on MLB Network for the first time and will be called by Matt Vasgersian, Sean Casey and Heidi Watney, along with MLB.com's Jonathan Mayo.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.