Someone over at the Orioles Hangout asked a great question the other day – if you have one game to win, who would be your starting pitcher?
I took 20 pitchers who have each faced at least 72 batters during postseason play since 2002. I originally used the pitchers listed in the OH thread, and then added others as their names came to me. I only used the regular season numbers for the season in which the pitcher appeared in the postseason. For instance, since 2002, Curt Schilling has appeared in the 2002, 2004, and 2007 postseasons. So I compared his 2002, 2004, and 2007 regular season numbers to his 2002, 2004, and 2007 post season numbers.
First, I want to attack the question using traditional stats, and my favorite – FIP ERA. Overall, the 20 pitchers combined to post a 3.45 ERA in the 12,400 regular season innings in which they appeared in the playoffs. The same 20 pitchers combined for a 3.88 ERA in 877 post season innings. The regular season FIP ERA of the pitchers was 3.65 compared to 4.11 during post season play. I personally found it interesting that the numbers represented a 12.4% increase in ERA compared to a 12.7% increase in FIP ERA. I will admit that I was surprised that the overall ERA actually increased. It has always been my assumption that the overall ERA tends to go down in post season play. Maybe that’s what I get for listening to announcers.
Now we know that the overall ERA goes up, but do the numbers give us a clue as to why? BABIP stayed about the same (it increased from .288 to .292). LOB% is relatively unchanged (73.6% up to 73.8%). WHIP goes up from 1.18 to 1.26. K% dropped from 19.7% down to 18.1%, while BB% goes from 6% up to 6.7%. Command Rate dropped from 3.31 down to 2.72. So the only relatively big changes seen thus far involved walks and strikeouts. I suppose this really shouldn’t be a surprise considering these pitchers are facing better hitters. Want another indicator that the pitchers are facing better hitting? HR/OFFB% went up a good amount (10.6% up to 12.2%) – this explains the increased ERA as much as anything.
Of the 20 pitchers in the survey, only six had a better post season ERA than regular season ERA. This caused me to think maybe the first comparison I made was negatively impacted by those at the bottom. So I decided to do another comparison, this one taking a look at the pitchers in the survey with the 10 best regular season ERAs. The ERA change this time was 2.99, compared to 3.13 in the post season. The FIP ERA change was 3.38 up to 3.67. Those represent a 5% and 7% increase, respectively.
We’ve looked at the overall numbers, how’d the pitchers do individually?
Curt Schilling’s postseason ERA during the time span is 3.17, compared to his 3.39 regular season ERA in the affected seasons.
The pitcher in the survey with the 5th best ERA improvement was Andy Pettitte (3.44 down to 3.13 in the postseason).
Chris Carpenter’s post season ERA was 2.53 compared to 2.95 in the affected regular seasons.
John Smoltz had the third best improvement in the survey – a 2.76 regular season ERA compared to a 1.96 post season ERA.
Mariano Rivera’s post season ERA since 2002 was an amazing 0.70 compared to 2.06 in the regular season.
The biggest ERA improvement from the regular season to the post season?
Drum roll, please.
Raise your hand if you guessed Josh Beckett. His regular season ERA during the 2003 and 2007 seasons was 3.18, compared to 1.78 during those two post seasons. Before someone says that it’s only two seasons, only three pitchers in the survey have faced more post season batters than Beckett since 2002.
The three pitchers with the biggest increase in ERA? Glavine (3.36 to 5.84), R Johnson (3.60 to 7.11), and Wang (3.73 all the way up to 7.58).
So how did they rank in overall post season ERA since 2002?
Rivera (0.70), Beckett (1.78), Smoltz (1.96), Carpenter (2.53), Pettitte (3.13),Schilling (3.17), Lackey (3.63), Oswalt (3.66), Santana (3.97), Wells (4.08),Zito (4.11), Mussina (4.19), Pedro (4.39), Clemens (4.50), Morris (4.96),Hudson (5.10), Glavine (5.84), Wakefield (5.91), R Johnson (7.11), Wang (7.58).
If you have one game to win, who would be your starting pitcher?
Based on this survey, Josh Beckett seems to be the best bet to me.
In my next post I’ll take a look at the question from a different angle.
Thanks.
Go Rockies!