After signing with the Royals, Bass played for the Rookie League Gulf Coast Royals in 2000. He went 3–5 with a 3.89 ERA in 12 games (nine starts).[2] Bass also made one start at the Single-A level for the Charleston Alley Cats.[2]
In 2001, Bass played for the Single-A Burlington Bees. Making 26 starts, he had a 4.65 ERA and went 3–10; his 10 losses are still an all-time high for him.[2] Bass played the entire 2002 season for the Bees again, improving his performance on the previous season, making 20 starts and finishing 5–7 with a 3.83 ERA.[2]
Bass had the best season of his minor league career in 2003 while playing for the Single-A Wilmington Blue Rocks. Making 26 starts, he went 9–8 with a 2.84 ERA.[2] He was third on the team in wins (9), second in the team in games started (26) and innings pitched (1521⁄3), and led the team in strikeouts with 119.[3] On August 6, against the Winston-Salem Warthogs, Bass came within one out of a no-hitter. Baseball America named Bass as the Royals eighth best prospect.
Bass went winless in 2004 while playing for the Rookie League Arizona Royals and the Double-A Wichita Wranglers. Losing a combined 5 games, he had a 5.94 ERA in 14 starts.[2] In 2005, while playing for the Wranglers again, Bass had a 12–8 record and a 5.24 ERA in 27 starts.[2]
In 2006, Bass split the season between the Arizona Royals, the Wichita Wranglers, and the Triple-A Omaha Royals. Making a combined 15 starts in 16 games, Bass went 6–7 with a 5.70 ERA.[2] Bass became a minor league free agent after the season.
Minnesota Twins (2007–2008)
Bass, after leaving the Royals organization, signed a minor league contract with the Minnesota Twins for the 2007 season.[4] Bass played the entire season for the Triple-A Rochester Red Wings. Bass made 10 starts and 27 relief appearances, finishing the season 7–3 with a 3.48 ERA.[2] Included in his 10 starts was a complete gameshutout, the second in his career and the first since 2001. Bass became a minor league free agent after the season; but, was re-signed by the Twins to a major league contract on November 29, 2007.[4]
Bass won a long relief role out of spring training with the Minnesota Twins. He made his major league debut on April 1 against the Los Angeles Angels of Anaheim, pitching 1.1 innings in relief in a 9–1 loss.[5] Bass appeared in 44 games as a reliever for the Twins, going 3–4 with an ERA of 4.87 with one save before being sent outright to the minors on August 20.[4][6]
On December 12, 2009, Bass was non-tendered by the Orioles, making him a free agent.[8]
Pittsburgh Pirates (2010)
On January 12, 2010, Bass signed a minor-league contract with Pittsburgh which included an invitation to spring training.[9] He appeared in four games and was designated for assignment on September 13.[10]
On May 27, 2012, Bass signed with the Houston Astros, and he was assigned to the Triple-A Oklahoma City RedHawks.[14] In 17 games (13 starts) with the RedHawks, Bass went 2–5 with a 5.56 ERA.[2]
Philadelphia Phillies (second stint) (2013)
On January 16, 2013, Bass signed a minor league contract to return to the Phillies.[15]
^Axisa, Mike (December 13, 2009). "Non-Tendered Players". MLB Trade Rumors. Archived from the original on December 14, 2009. Retrieved January 22, 2022.