John Koronka career ERA

• Best season on file: 5.69 in 2006.
• Most recent: 11.05 in 2009.

Figures come from ESPN's box scores and were last read on September 22, 2026.

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John Koronka career ERA, season by season

Season↓	Team↓	GP↓iGP: Games the player appeared in, however briefly.	W↓iW: Games in which this pitcher was credited with the win.	L↓iL: Games in which this pitcher was charged with the loss.	ERA↓iERA: Earned runs allowed per nine innings pitched — lower is better. Under 3.00 is excellent.	IP↓iIP: Innings pitched. The decimal counts outs, so 6.2 is six innings and two more outs.	K↓iK: Batters this pitcher struck out.	BB↓iBB: Times the batter reached first base on four balls.	WHIP↓iWHIP: Walks and hits allowed per inning pitched — lower is better. Around 1.00 is elite.	SV↓iSV: Games finished by protecting a narrow lead to the last out.
2005	CHC	4	1	2	7.47	15.2	10	8	1.72	0
2006	TEX	23	7	7	5.69	125.0	61	47	1.54	0
2007	TEX	2	0	2	7.84	10.1	2	5	2.03	0
2009	MIA	2	0	2	11.05	7.1	4	7	2.45	0

What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV