Today’s post is brought to you by Vince Velasquez who is schedule to face the Marlins. When I decide which pitchers to target, I look for who is facing some of the weaker offenses and Velasquez popped for being interesting (3.68 ERA, 11.4 K/9) and available. I noticed his 15% K% (5.8 BB/9) and moved on. He broke my simple rule of not rostering a player with a walk rate over 10% BB%. But is 10% the right value? After diving into the numbers, it’s not a bad rule, but I’ll try to shrink that number down.
I use 10% because it’s simple to remember. The equivalent is 3.9 BB/9 which could be rounded up to an even 4.0 BB/9. The deal is that while simple rules help, I’d like to have every advantage. For example, I used to use a 50% GB% to show an advantage. The deal is that between 50% and 55% GB, the pitcher doesn’t gain any advantage in double plays and additional high flyballs (i.e. outs).
The other reason I picked 10% is that only a few pitchers reach this total. Of the 68 qualified starters this season, nine have a walk rate of 10% or higher.
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