Arizona, Detroit, Milwaukee, and Toronto pens

This week's column takes a look at the bullpens for the Arizona Diamondbacks, Detroit Tigers, Milwaukee Brewers, and Toronto Blue Jays. It also takes a little more of a look at the interplay between actual ERA and xERA.

We start with the Arizona Diamondbacks, who have gone from Paul Sewald (RHP, ARI) as closer to more of a temporary committee, at least until Sewald gets back on track after a month of scuffling through.  Here are the numbers so far:

ARI	SV	HD	IP	ERA	xERA	WHIP	K%	K-BB%	HR/9
Sewald, Paul	16	1	29.2	3.94	4.36	1.15	24%	17%	1.2
Ginkel, Kevin	5	13	49.2	3.08	3.4	1.15	24%	20%	0.5
Thompson, Ryan	2	21	47.2	2.27	3.35	1.05	18%	13%	0.8
Puk, A.J. L	2	10	49	4.04	4.31	1.29	25%	13%	0.6
Martinez, Justin	2	6	50.1	1.97	2.82	1.21	29%	17%	0.2
Mantiply, Joe L	1	11	42	3.86	4.02	1.21	20%	13%	0.2

With Sewald...

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