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In MLB babseball, the home plate umpire can impact the results of the game. Umpires with smaller strike zones are "hitters umps" and umpires with larger strikes zones are "pitchers umps". When betting totals (the total number of runs scored by both teams) in a MLB baseball game, it is important to take into account an umpire's history of overs/unders when he was behind the plate. Most umpires show no bias one way or the other, but there are a few that do. It takes about 20 games before any trend can be viewed as reliable, but if an umpire is calling games that go over or under 60%-70% of the time or more, you'd be prudent to adjust the expected run total of the game up or a down by about a half run; anything above 70% is a whole run adjustment.
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Here is the table of all MLB umpires that have umpired at least one game behind the plate in 2009. This table is updated daily, usually around 10 am EST, and provides each MLB baseball umpire's over and under results from 2005 to the present.
| Umpire name | Overs | Unders | Over % | Under % | Adjustment |
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| Lance Barksdale | 51 | 50 | 50 | 50 | None | | Ted Barrett | 47 | 63 | 43 | 57 | None | | Scott Barry | 17 | 26 | 40 | 60 | None | | Damien Beal | 2 | 5 | 29 | 71 | Too few games | | Wally Bell | 48 | 53 | 48 | 52 | None | | CB Bucknor | 55 | 57 | 49 | 51 | None | | Angel Campos | 21 | 11 | 66 | 34 | +0.5 run | | Mark Carlson | 34 | 41 | 45 | 55 | None | | Kevin Causey | 6 | 4 | 60 | 40 | Too few games | | Gary Cederstrom | 54 | 53 | 50 | 50 | None | | Delfin Colon | 2 | 1 | 67 | 33 | Too few games | | Eric Cooper | 58 | 49 | 54 | 46 | None | | Derryl Cousins | 58 | 55 | 51 | 49 | None | | Jerry Crawford | 43 | 36 | 54 | 46 | None | | Fieldin Culbreth | 54 | 57 | 49 | 51 | None | | Phil Cuzzi | 54 | 57 | 49 | 51 | None | | Kerwin Danley | 48 | 53 | 48 | 52 | None | | Gary Darling | 54 | 52 | 51 | 49 | None | | Bob Davidson | 54 | 57 | 49 | 51 | None | | Gerry Davis | 62 | 50 | 55 | 45 | None | | Dana DeMuth | 50 | 52 | 49 | 51 | None | | Laz Diaz | 52 | 65 | 44 | 56 | None | | Mike DiMuro | 26 | 27 | 49 | 51 | None | | Rob Drake | 55 | 57 | 49 | 51 | None | | Bruce Dreckman | 54 | 49 | 52 | 48 | None | | Doug Eddings | 51 | 63 | 45 | 55 | None | | Paul Emmel | 55 | 50 | 52 | 48 | None | | Mike Estabrook | 9 | 17 | 35 | 65 | -0.5 run | | Mike Everitt | 58 | 53 | 52 | 48 | None | | Chad Fairchild | 49 | 39 | 56 | 44 | None | | Andy Fletcher | 35 | 53 | 40 | 60 | None | | Marty Foster | 46 | 56 | 45 | 55 | None | | Greg Gibson | 55 | 52 | 51 | 49 | None | | Brian Gorman | 53 | 58 | 48 | 52 | None | | Chris Guccione | 63 | 56 | 53 | 47 | None | | Tom Hallion | 57 | 56 | 50 | 50 | None | | Angel Hernandez | 52 | 59 | 47 | 53 | None | | Ed Hickox | 48 | 47 | 51 | 49 | None | | John Hirschbeck | 27 | 37 | 42 | 58 | None | | Bill Hohn | 17 | 23 | 42 | 58 | None | | Sam Holbrook | 63 | 45 | 58 | 42 | None | | James Hoye | 51 | 49 | 51 | 49 | None | | Marvin Hudson | 53 | 54 | 50 | 50 | None | | Dan Iassogna | 55 | 56 | 50 | 50 | None | | Adrian Johnson | 31 | 27 | 53 | 47 | None | | Jim Joyce | 60 | 53 | 53 | 47 | None | | Jeff Kellogg | 55 | 58 | 49 | 51 | None | | Brian Knight | 36 | 48 | 43 | 57 | None | | Ron Kulpa | 41 | 59 | 41 | 59 | None | | Jerry Layne | 44 | 51 | 46 | 54 | None | | Alfonso Marquez | 52 | 48 | 52 | 48 | None | | Randy Marsh | 48 | 48 | 50 | 50 | None | | Tim Mcclelland | 61 | 52 | 54 | 46 | None | | Jerry Meals | 59 | 49 | 55 | 45 | None | | Chuck Meriwether | 47 | 62 | 43 | 57 | None | | Bill Miller | 48 | 63 | 43 | 57 | None | | Edward Montague | 45 | 38 | 54 | 46 | None | | Casey Moser | 1 | 2 | 33 | 67 | Too few games | | Mike Muchlinski | 6 | 17 | 26 | 74 | -1.0 run | | Paul Nauert | 59 | 52 | 53 | 47 | None | | Jeff Nelson | 36 | 59 | 38 | 62 | -0.5 run | | Brian O'Nora | 46 | 48 | 49 | 51 | None | | Tony Randazzo | 36 | 39 | 48 | 52 | None | | Ed Rapuano | 52 | 61 | 46 | 54 | None | | Mike Reilly | 58 | 51 | 53 | 47 | None | | Charlie Reliford | 45 | 43 | 51 | 49 | None | | DJ Reyburn | 3 | 3 | 50 | 50 | Too few games | | Jim Reynolds | 63 | 42 | 60 | 40 | +0.5 run | | Brian Runge | 52 | 52 | 50 | 50 | None | | Paul Schrieber | 50 | 48 | 51 | 49 | None | | Dale Scott | 53 | 59 | 47 | 53 | None | | Todd Tichenor | 13 | 10 | 57 | 43 | None | | Chris Tiller | 1 | 6 | 14 | 86 | Too few games | | Tim Timmons | 53 | 60 | 47 | 53 | None | | Tim Tschida | 60 | 54 | 53 | 47 | None | | Larry Vanover | 67 | 44 | 60 | 40 | +0.5 run | | Mark Wegner | 58 | 52 | 53 | 47 | None | | Bill Welke | 56 | 58 | 49 | 51 | None | | Tim Welke | 52 | 50 | 51 | 49 | None | | Hunter Wendelstedt | 60 | 51 | 54 | 46 | None | | Joe West | 57 | 51 | 53 | 47 | None | | Mike Winters | 51 | 53 | 49 | 51 | None | | Jim Wolf | 51 | 57 | 47 | 53 | None |
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