There are many pitchers like this. This is why I don't agree with Sabrematricians that say pitchers W-L is pretty useless. Some pitchers just know how to hold on to a lead. If you only score one run, the pitcher will shut them out. If you score 6, he may give up 4 or 5. If you have a lot of the latter, the ERA etc. won't look very good, but wins are what matters. I am not saying W-L is the be-all, end-all, but it is more important than many give it credit for.