[2] While playing for the Aztecs, Alfaro was selected for the United States national baseball team to compete at the 1984 Summer Olympics.

He ended up playing alongside future well known Major League Baseball players such as Mark McGwire, Barry Larkin, Will Clark, Cory Snyder, Bobby Witt, Oddibe McDowell, Shane Mack, Gary Green, and Bill Swift, among others.

In the team's opening game against Chinese Taipei, Alfaro reached base via an error,[4] and came around to score the game-winning run in the seventh inning of a 2–1 win.

[2] In that game, Alfaro's delay in covering second base on a pickoff attempt led to Kozo Shoda stealing third and eventually scoring.

[9][10] However, he retired after a back injury and a contract dispute with Brewers management over which level in the minor leagues he would play.