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One of the things we (as Ranger fans) have discussed at some length is Joe Nathan's stuff, which isn't the same in 2013 as it has been in years past.
Over at Sports on Earth, Howard Megdal has a piece on the evolution of Joe Nathan, and how he is getting hitters out and closing games as a different pitcher than he has been in years past.
Its an interesting piece, and delves into some of the areas we've talked about before, so I'd encourage you to check it out.