Mañón was originally signed as an undrafted free agent by the St. Louis Cardinals in 1993. He did not make his debut until 2003 with the Montreal Expos. He went 1–2 with a 4.13 ERA in 23 games.\n', '

After the 2003 season, his contract was sold to the Kia Tigers of the Korean Baseball League. He spent the 2005 season in Taiwan, with the Uni-President Lions of the Chinese Professional Baseball League.\n', '

Mañón came back to baseball in the United States in 2006, when he signed a minor league contract with the Baltimore Orioles on March 6. He would later go on to go 0–1 with a 5.40 ERA in 22 games for the Orioles and played in the Triple A All-star game whilst playing for the Ottawa Lynx. He then was granted free agency after the 2006 season on November 19. On June 5, 2007, he signed a minor league contract with the Cincinnati Reds. After that, he was traded to the Athletics on July 13 to complete an earlier deal that had sent pitchers Kirk Saarloos and Dan Denham to the Reds and pitcher David Shafer to the Athletics. He spent the most of the 2008 season playing in the Orioles organization for the Double-A Bowie Baysox.\n', '

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