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Oakland Athletics starting pitcher Bartolo Colon prepares to deliver against Los Angeles Angels in the third inning of a MLB game at O.co Coliseum in Oakland, Calif., on Tuesday, Aug. 7, 2012. (Ray Chavez/Staff)

OAKLAND -- Bartolo Colon, who was suspended for testing positive for a performance-enhancing substance this season, is returning to the Oakland A's.

The A's agreed to a one-year contract with starting pitcher for the 2013 season, the team announced Saturday.

Colon was 10-9 with a 3.43 ERA in 24 starts with the A's in 2012 when he was suspended for 50 games Aug. 22 after testing positive for Testosterone, a performance-enhancing substance in violation of Major League Baseball's Joint Drug Prevention and Treatment Program.

Colon has five games remaining on the suspension.

The A's will have Colon, Brett Anderson, Tommy Milone, Jarrod Parker, A.J. Griffin, Travis Blackley, Dan Straily, Brad Peacock, Tyson Ross and Sonny Gray to choose from when picking their 2013 rotation. Also, free-agent Brandon McCarthy could also return to Oakland.

Colon, who is currently pitching for Aguilas in the Dominican Winter League, was recently taken to the hospital after getting hit in the mouth with a line drive. Colon is 1-0 with a 2.89 ERA in two starts in the Dominican league.

This season marked the ninth time Colon has won 10 games in a season, but it was his first 10-win season since 2005. His 3.43 ERA was the second lowest of his career and he averaged just 1.36 walks per nine innings, which was the lowest mark of his career.

The 39-year-old right-hander was 6-7 with a 4.22 ERA over his first 15 starts before going on the disabled list with a strained right oblique. He was reinstated July 3 and went 4-2 with a 2.30 ERA over his final nine starts.

Colon has a career record of 171-122 with a 4.05 ERA in 381 games, including 375 starts, in 15 seasons with seven teams. He ranks third in Major League history among Dominican-born pitchers in wins, strikeouts (1,833), games started and innings pitched (2393.1). Among pitchers active during the 2012 season, he ranks sixth in complete games (32), ninth in wins and 10th in strikeouts.