Relievers, May 2025 skills leaders

This week, we look at BPI leaders among relievers by K%-BB% who have at least fifteen innings pitched. The groupings are filtered to clump similar relievers together.

The first such grouping has the seven relievers with an elite K-BB% greater than 30% through May:

YTD	SV	HD	IP	xERA	WHIP	K%	K-BB%	HR/9
Jax, Griffin MIN	0	14	24.2	2.11	1.22	39%	35%	1.1
Miller, Mason ATH	12	0	18.2	2.39	1.39	44%	32%	1.5
Hader, Josh HOU LHP	14	0	24.0	2.92	0.79	38%	31%	0.8
Yates, Kirby LA	1	8	18.2	2.66	1.29	39%	31%	1.5
Speier, Gabe SEA LHP	0	7	20.0	2.36	0.90	36%	31%	0.9
Estrada, Jeremiah SD	1	9	24.1	3.03	1.07	37%	30%	1.1
Hoffman, Jeff TOR	12	0	24.1	2.69	1.07	36%	30%	1.9

Athletics closer Mason Miller (RHP, ATH), has a 44% K% and 32% K%-BB% for a 2.39 xERA. That is elite. The combination of sub-par WHIP and 1.5 HR/9, however, gives him...

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