Below you’ll find links to a variety of leaderboards for Infield Outs Prevented (IFOP) and Infield Outs per 100 Balls In Play (IFO/C). All the raw data for these leaderboards comes from Baseball-Reference.com

, though I compiled all the tables and performed the calculations myself. The links within the tables go to Baseball-Reference.

All leaderboards go back to only 2003. The location-specific batted ball data technically goes back to 1988, but there are irregularities in the data in 1998, 2000-2002, and a few other years. So, for now, I’ve only got reliable data for the past few seasons.

Individual Player Leaderboards

• Highest IFOP and Lowest IFO/C by Season: 2010
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  | 2009
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  | 2008
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  | 2007
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  | 2006
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  | more coming eventually

Team Leaderboards

• Highest IFOP and Lowest IFO/C by Season: 2010
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  | 2009
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  | more coming eventually

Leaguewide Data

• OPP for All MLB: By Season
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Any ideas for other leaderboards? Leave them in the comments.

If you are curious about a player or team’s IFOP, you can find all the information you need using Baseball-Reference’s Event Finder (in the Play Index). Just search for hits, reaches on error, and all outs (checking the double-play box), then click on the red text for each of the six infield positions to restrict the results to the infield. If you don’t have a Play Index subscription, you can also find these numbers in a player’s Batting Splits page.

Here’s the simple formula for calculating IFOP:

IFOP = IFH + IFROE – IFDP

IFH = infield hits
IFROE = times reaching on infield errors or fielder’s choices in which no out is recorded
IFDP = times hitting into double plays on the infield (non-ground ball double plays included)

IFOP values vary from year to year, but in 2010, +5 was league average for qualified batters. Ichiro led the league (by far) at +69; Derrek Lee and Billy Butler tied for worst at -15.

If you want to calculate IFO/C, you’ll also need the total number of balls a player hit on the infield (IFBIP). This can be found with the event finder or in a player’s Batting Splits page–just use At-Bats plus Sacrifice Flies (on the infield only of course). IFO/C can then be calculated as follows:

IFO/C = 100 – (100 * IFOP / IFBIP)

IFOP = infield outs prevented (defined above)
IFBIP = infield balls in play (total number of balls hit on the infield)

In 2010, the league average IFO/C was 96. The best qualified rate was Ichiro’s 80.1 and the worst was Derrek Lee’s 109.3.