In 1999 Moreno went 1-4 with a 4.04 ERA in 42+1⁄3 innings pitched in the Dominican Summer League. He went 1-2 with two saves and a 9.90 ERA in 10 innings in the Arizona League.
Moreno went 5-2 with two saves and a 2.40 ERA in 71+1⁄3 innings in the Venezuelan Summer League in 2000, marking his last season with the Diamondbacks.
Philadelphia Phillies
He went 4-2 with a 1.69 ERA in 26+2⁄3 innings pitched in the Gulf Coast League in 2001.
In 2002 he went 3-3 with five saves and a 3.71 ERA in 26+2⁄3 innings for the Class-A Batavia Muckdogs. Moreno went 1-0 with one save in 10 scoreless innings for the Class-A Lakewood BlueClaws.
Minnesota Twins
Moreno went 3-1 with a 2.03 ERA in 26+2⁄3 innings for the Class-A Advanced Fort Myers Miracle. He went 1-1 with a 6.95 ERA in 33+2⁄3 innings for the Double-A New Britain Rock Cats in 2003.
He went 1-0 with a 6.35 ERA in 11+1⁄3 innings for Triple-A Rochester Red Wings and also went 7-2 with two saves and a 2.27 ERA in 75+1⁄3 innings for Double-A New Britain in 2004.
Oakland Athletics
Moreno went 4-2 with two saves and a 4.50 ERA in 74 innings for the Triple-A Sacramento River Cats in 2005 and in 2006, again playing for the River Cats he went 5-4 with four saves a 5.38 ERA in 100+1⁄3 innings.
Baltimore Orioles
Moreno played for the Norfolk Tides in 2007 going 2-5 with a 5.06 ERA in 36 games, one for a start.
In a seven-season minor-league career, Moreno has posted a 31-21 record with a 4.20 ERA and 18 saves in 237 appearances.