As far as pitchers’ statistics in baseball, earned run average (ERA) is the batting average of those stats. ERA is how many earned runs a pitcher gives up per nine innings, and anything under 4.00 is pretty good while anything under 3.00 is very good and anything under 2.00 is bordering on sick. So here is a list of your Top 10 active pitchers in ERA:

1. Mariano Rivera, New York Yankees (2.28)—You want to know why this guy comes in and shuts the door every time he’s brought in for a save? Look no further than this statistic. Mo has been the most dominant closer in the game for over a decade and shows no signs of slowing down.

2. Pedro Martinez, free agent (2.91)—Sure, he’s not the same guy he was in Boston or even Montreal, but Pedro’s a gamer and it’s hard to believe he still isn’t on a major league roster right now.

3. Johan Santana, New York Mets (3.10)—You have to watch this guy work to fully appreciate his art of pitching. He doesn’t have an overpowering fastball, but he locates all his pitches beautifully and his change-up sometimes makes batters swing out of their shoes. He’s like a lefty Greg Maddux.

4. Roy Oswalt, Houston Astros (3.14)—At 31, Oswalt has a lot of career left, and he has one of the game’s best fastballs.

5. Jake Peavy, San Diego Padres (3.26)—Peavy was rumored to be traded to the Cubs about 12 times in this past off-season. If you close your eyes, you can someday picture him in Yankee pinstripes.

5. John Smoltz, Boston Red Sox (3.26)—One of the game’s good guys, and as a Mets’ fan, that is not easy for me to say. I’m just glad he’s now in the American League.

7. Brandon Webb, Arizona Diamondbacks (3.27)—At 30, Webb is another of the game’s bright young stars and he’ll be in contention for many more Cy Young Awards.

7. Randy Johnson, San Francisco Giants (3.27)—The Big Unit is 45 years old and creeping up on 300 wins. And yeah, he’s racked up an incredible 4801 strikeouts. But his 3.27 ERA over 22 seasons is just awesome.

9. Carlos Zambrano, Chicago Cubs (3.50)—Is it possible that Carlos Zambrano is only 28 years old? Yes, and he’s going to be dominant for quite some time.

10. Tim Hudson, Atlanta Braves (3.48)—He’s battled injuries, but when he’s on top of his game, Hudson is one of the best in the game. And he turned out to be the best among that awesome young trio in Oakland that included Mark Mulder and Barry Zito.

Source: Baseball Reference