vs RHB as LHP

Someone tweeted today saying "Having three left-handed relievers might not actually be a good thing. Weakens your options against strong RHB, though MLB is weak there" He was talking about Miller, Wilson, and Shreve just acquired by the Yankees.

Well, I just read an article saying Shreve who stands on the right side of the rubber does not give right-handed hitters a good look thus pitches well against them. I looked up the stats of Miller, Wilson, and Shreve against RHB, and the opponent hitters hit just 51 for 292 (.175 batting average) against them.

I went on and found a list of LHP, with GS <=5 and IP >= 10 in 2014, and sorted by the batting average against. Miller, Shreve, and Wilson were ranked 2nd, 6th, and 16th, respectively.

	Player	IP	IPtot	H	AB	BA	OBP	SLG	OPS
1	Aroldis Chapman	41.2	54	16	136	0.118	0.239	0.176	0.415
2	Andrew Miller	36	62.1	18	124	0.145	0.245	0.202	0.446
3	Fernando Abad	31.2	57.1	17	105	0.162	0.217	0.257	0.475
4	James Russell	35.1	57.2	20	121	0.165	0.239	0.182	0.421
5	Ian Thomas	5.1	10.2	3	18	0.167	0.286	0.167	0.452
6	Chasen Shreve	6.1	12.1	4	24	0.167	0.2	0.208	0.408
7	Jake McGee	52	71.1	31	182	0.17	0.232	0.22	0.452
8	Tony Sipp	24.1	50.2	16	91	0.176	0.235	0.297	0.531
9	Zach Britton	50.2	76.1	31	170	0.182	0.265	0.294	0.559
10	Oliver Perez	36	58.2	23	125	0.184	0.306	0.296	0.602
16	Justin Wilson	38.2	60	29	144	0.201	0.324	0.299	0.622

A group of solid relievers I see. Jacob Lindgren can be added, too. I guess Girardi doesn't have to worry too much about when to use his lefties in the pen.