The Expos added Moraga to the Major League roster for the first time on June 11, 2000 following an injury to T. J. Tucker. He made his Major League debut on June 11 against the Toronto Blue Jays in Toronto and faced two batters, throwing a wild pitch, recording no outs, allowing an inherited runner to score and allowing two earned runs of his own. The Expos designated Moraga for assignment on June 17, 2000, at which point he had a 37.80 earned run average (ERA) in three pitching appearances.
The following day, the Rockies claimed Moraga off waivers. On September 20, the Rockies recalled Moraga from Triple-A Colorado Springs where he had credited minor league pitching coach Jim Wright with teaching him to throw a slider properly. He appeared in one game for the Rockies and allowed five earned runs in one inning pitched. Following the season, he was returned to the minors. His career 40.50 ERA is the highest of any pitcher with four or more career appearances.
Moraga pitched in Minor League Baseball until 2003. He returned to professional baseball in 2008 when he pitched in the independent Northern League. He was a Northern League All-Star in 2008 with the Joliet JackHammers. His final season came in 2009 with the Edmonton Trappers.

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