For a reliever just a single bad outing can seriously skew their ERA in a season this short. No Jays RP will reach 30 IP this year and at 30 IP, just 1 earned run will make a difference of 0.3 in their ERA.
I think the best thing to do to evaluate a reliever, especially this season is their WHIP. I found a chart that shows < 1.10 WHIP is great, 1.11-1.25 is above average, 1.26-1.32 is average. But even that will be seriously skewed by a bad outing. For example, for Yamaguchi his WHIP is 1.57 currently, but without that Yankees game, it would just be 1.30 despite his slow start.
I think with anyone this year you have to go in and look at their game logs and see if their poor numbers are from a couple bad outings, or if they really are "average" for them.
For me, if I were the one deciding the playoff roster, I'd eliminate their worst two outings and rank them without those, to compare how they look compared to their overall numbers.
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