We've taken plenty of time to beat DD's poor bullpen management to death, but I don't think we should let his decisions slide just because we managed to eke out the win last night.
First (maybe) bad decision: Leaving Guts in to start the 7th with 107 pitches under his belt. (Wasn't our last argument also about leaving him in too long?) He proceeds to give up two hits before being pulled. Here's a FanShot I posted the other day with a handy chart detailing how a pitcher gets worse and worse the more pitches he throws. One argument why this is the case is because not only is he tiring, but he's going through the order a second, third, and fourth time and the batters are catching onto him. Note that Guts came back in the 7th to face the top of the order for the 4th time.
This one is a tough call. Guthrie has pitched well against the Sox in the past and he was having a tremendous game. Last time we were arguing he had another 10 or so pitches under his belt and he was just having a decent game. This time he had a 7:1 K:BB ratio in 6 IP. I think this was truly a toss-up decision, even though the chart indicates that the average pitcher has a significantly higher BA, OBP, and SLG against.
Second (clearly) bad decision: Bringing in Walker to face Ortiz. Duh. Ortiz now has a career line of .438/.471/1.000 in 16 ABs vs. Walker. JW has been terrible lately. Why oh why oh why?
All I have to say is thank God for Jim Johnson. I can't say that his strand rate and K:BB ratio give me much comfort, but man did he come up big last night!