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Quick Look: JB Wendelken’s Weekend Surge

How does Wendelken’s season stack up to last fall’s mini-breakout?

MLB: Oakland Athletics at Houston Astros John Glaser-USA TODAY Sports

When you head to and search for the league’s highest performing relievers you see Josh Hader’s name atop the list. Not hard to fathom He’s really good. The name underneath the fireballing lefty is none other than Oakland A’s pitcher JB Wendelken. Certainly a surprise to most outside of A’s fans.

Following the weekend series against Houston in which Wendelken threw 4.1 innings, allowing 1 earned run with 7 Ks. In total Wendelken has thrown 10.1 innings, allowing just 2 earned runs and striking out 13 batters against zero walks.

Just prior to 2018’s AL Wild Card game I examined Wendelken’s sudden rise to prominence. Two things stood out then and that hasn’t changed: fastball velocity and curveball usage.

Per Pitch Info:

Wendelken’s Velocity/Usage

Season FA% FA Velocity CH% CH Velocity CU% CU Velocity
Season FA% FA Velocity CH% CH Velocity CU% CU Velocity
2016 65.4 % 94 24.6 % 83.5 9.6 % 80.3
2018 60.9 % 95.2 13.6 % 85.2 25.5 % 80.7
2019 53.7 % 95.3 23.9 % 86.7 22.4 % 80.5

You can see in the graph below Wendelken’s ERA in relation to his fastball velocity:

JB Wendelken’s ERA seems to tie directly with his velocity increase.

Each pitch seemingly has its own specialty. His fastball generates the most strikeouts (42.9%), while his curveball generates the most groundballs (83.3%). His changeup is his chase pitch, generating most of his swinging strikes (18.8%), especially on pitches outside of the zone (53.3%).

Wendelken avoids hard contact (33.3% hard-hit with 0 barrels allowed and .154 xwOBA) and he has yet to walk a batter. It won’t be long before he enters the conversation regarding Oakland’s best relief arm, if he hasn’t already.