- Bats Right, Throws Right
- Height 5' 10", Weight 170 lb.
- School University of New Mexico
- Debut August 7, 2004
- Final Game October 3, 2004
- Born May 9, 1976 in Grand Junction, CO USA
Jim Serrano was drafted in the 18th round (534th overall pick) by the Montreal Expos in the 1998 draft. Serrano debuted with the A Vermont Expos of the New York-Penn League, and went 0-0 with 5 saves a 1.17 ERA in 7 games, before being promoted to the A Cape Fear Crocs of the South Atlantic League where he finished going 2-0 with 3 saves and a 3.65 ERA in 15 games. He played with the A Jupiter Hammerheads of the Florida State League in 1999, where he went 8-5 with 8 saves and a 2.13 ERA in 44 games, and also went 43.2 consecutive innings without a earned run scored against him, which was the longest streak in the minors that year. In 2000, Serrano played with the AA Harrisburg Senators, where he went 4-5 with 16 saves and a 4.20 ERA in 55 games. Serrano opened the 2001 season with the Senators, and went 6-3 with 20 saves and a 2.18 ERA in 47 games, and had 12.28 strikeouts/per 9 innings before being promoted to the AAA Ottawa Lynx, where he finished with a 0-1 record with 0 saves and a 4.50 ERA in 9 games.
Serrano was traded to the New York Mets on March 24, 2002 with outfielder Jason Bay for infielder Lou Collier, and pitched with the AAA Norfolk Tides, going 8-6 with 3 saves and a 4.01 ERA in 53 games. He opened the 2003 season with the Tides, going 1-2 with 0 saves and a 2.39 ERA in 27 games before being traded to the Kansas City Royals on July 5. He finished the season out with the AAA Omaha Royals, going 3-2 with 3 saves and a 3.21 ERA in 19 games. Serrano began the 2004 season with the Omaha Royals, but struggled going 1-1 with a 5.01 ERA in 16 games, and was demoted to the AA Wichita Wranglers where he became a starter and went 3-1 with a 1.96 ERA in 11 games. He made his major league debut with the Royals on August 7, and went 1-2 with a 4.68 ERA in 10 games/5 starts in what would be his only major league season.
Serrano was granted free agency by the Royals at the end of the 2004 season, and signed with the Oakland Athletics on November 15. He opened the 2005 season with the AAA Sacramento River Cats going 4-4 with a 3.75 ERA in 12 games, though was released by the A's and was later picked up by the Cincinnati Reds on July 2, and went 8-3 with a 3.91 ERA in 16 games with the AAA Louisville Bats. The Boston Red Sox invited Serrano to spring training on February 1, 2006, and optioned him to the AAA Pawtucket Red Sox and went 4-5 with a 2.50 ERA in 13 games before being acquired by the SK Wyverns of the Korea Baseball Organization