At Chatsworth High School, Dominguez played third base and Moustakas was the shortstop. Moustakas was the No. 2 overall pick in the 2007 First-Year Player Draft and Dominguez went No. 12.
Dominguez and Moustakas were just the sixth set of teammates to be selected in the first round of the same Draft.
"For us to go in the first round together, make it to the Major Leagues and now play against each other, is quite an honor," Dominguez said. "It has been a dream-come-true for both of us."
Moustakas has endured a season-long struggle at the plate. He entered Sunday's game hitting just .180 with four homers and 12 RBIs. Dominguez started the day at .241 with nine homers and 32 RBIs.
Dominguez and Moustakas had dinner together following Friday's series opener.
"We talked a little about the game, but mostly about high school and the memories growing up," Dominguez said. "It's always good to see an old friend and be able to catch up."
Robert Falkoff is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.