Tyler Yates - worthy of consideration in a NL only?

Tyler Yates looks like a reliever that could be of some help in NL only leagues. Take a look at these numbers through Friday:

IP	ERA	xERA	H%	S%	Ctl	Dom	Cmd	G/F	hr/f	hr/9
24.7	4.01	2.32	28%	63%	3.7	9.1	2.5	1.17	4%	0.36

Yates has shown good dominance with a 9.1 K/9, solid command and he's been keeping the ball in the park. He's been hurt a bit by a low strand rate which should correct itself over time - thus the 2.32 xERA. Yates' control is still a little bit high (3.0 or less is the benchmark) so there is a bit of a risk here. Walks have always been his biggest problem but he is making strides here this season.

Considering that Bob Wickman and Rafael Soriano have both been injury prone there could be an opportunty for saves for Yates this season. Of course, he'd likely need injuries to both pitchers at the same time to get an opportunity. For now, he's probably only worth keeping an eye on in NL only leagues though his strikeouts and potential for a few vulture wins could make him worth consideration now.