While playing in the Reds farm system with the Stockton Ports in 2002, he was named to the California League All-Star team.

He made his major league debut for the Cubs on June 1, 2005 against the Los Angeles Dodgers and gave up 3 runs over 5 innings, walked 3, and struck out 5 for the win.

He was expected to compete for a spot on the rotation in 2007, but failed to make the Rangers' big league roster.

On December 21, 2007, the Colorado Rockies signed Koronka to a minor league contract with an invitation to spring training.

He started 3 games for the Buffaloes, finishing 0–1 with a 6.75 E.R.A.. On January 13, 2009, Koronka signed a minor league deal with the Florida Marlins.

On January 28, 2010, Koronka signed a minor league contract with the Los Angeles Dodgers with an invite to spring training.

On July 26, 2010, Koronka signed a contract with the Lancaster Barnstormers of the Atlantic League of Professional Baseball.

On August 7, 2010, Koronka signed with the Southern Maryland Blue Crabs of the Atlantic League of Professional Baseball.