Antonio Alfonseca career ERA
4.11Career Regular Season
Antonio Alfonseca has a career ERA of 4.11 over 11 regular seasons.
- Best season on file: 2.57 in 2004.
- Most recent: 5.44 in 2007.
Average of 11 regular seasons, 1997 through 2007. Figures come from ESPN's box scores and were last read on September 22, 2026.
| GP: Games the player appeared in, however briefly. | W: Games in which this pitcher was credited with the win. | L: Games in which this pitcher was charged with the loss. | ERA: Earned runs allowed per nine innings pitched — lower is better. Under 3.00 is excellent. | IP: Innings pitched. The decimal counts outs, so 6.2 is six innings and two more outs. | K: Batters this pitcher struck out. | BB: Times the batter reached first base on four balls. | WHIP: Walks and hits allowed per inning pitched — lower is better. Around 1.00 is elite. | SV: Games finished by protecting a narrow lead to the last out. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 1997 |  MIA | 17 | 1 | 3 | 4.91 | 25.2 | 19 | 10 | 1.79 | 0 |
| 1998 | MIA | 58 | 4 | 6 | 4.08 | 70.2 | 46 | 33 | 1.53 | 8 |
| 1999 | MIA | 73 | 4 | 5 | 3.24 | 77.2 | 46 | 29 | 1.39 | 21 |
| 2000 | MIA | 68 | 5 | 6 | 4.24 | 70.0 | 47 | 24 | 1.51 | 45 |
| 2001 | MIA | 58 | 4 | 4 | 3.06 | 61.2 | 40 | 15 | 1.35 | 28 |
| 2002 |  CHC | 66 | 2 | 5 | 4.00 | 74.1 | 61 | 36 | 1.47 | 19 |
| 2003 | CHC | 60 | 3 | 1 | 5.83 | 66.1 | 51 | 27 | 1.55 | 0 |
| 2004 |  ATL | 79 | 6 | 4 | 2.57 | 73.2 | 45 | 28 | 1.34 | 0 |
| 2005 | MIA | 33 | 1 | 1 | 4.94 | 27.1 | 16 | 14 | 1.57 | 0 |
| 2006 |  TEX | 19 | 0 | 0 | 5.63 | 16.0 | 5 | 7 | 1.88 | 0 |
| 2007 |  PHI | 61 | 5 | 2 | 5.44 | 49.2 | 24 | 27 | 1.85 | 8 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV