Chris Volstad has had a specific problem in all of his starts this year. The big inning has turned him into an 0-5 pitcher with a 6.92 ERA. Most of that damage has been done by having big innings. If we look at his current year's performance versus his career numbers, we can see exactly where the problem is illustrated in his stats.
Prior to this year his performance with the bases empty and man on base were very similar. This year there are striking differences. In 2012 his splits with men on base and, in particular with men in scoring position, had spiked up dramatically. In other words when he has to go to the stretch, his performance has been terrible. All of the metrics used to identify value have turned them into a batting practice pitcher in those instances. Everything from batting average and percentage of strikes thrown to BABIP and SLG have gone through the roof with men on base. Here are some of the comparisons between career averages and 2012.
Career Bases Empty Career Men on Base 2012 Bases Empty 2012 Men on Base
BA .260 .282 .241 .316
SLG .415 .459 .322 .571
GB% 50.4 50.0 53.3 42.4
LD% 19.2 17.1 16.0 22.0
% Strikes 61.7 61.4 64.0 63.0
BB% 7.4 8.9 3.3 10.5
BABIP .285 .331 .260 .361
Looking at a few more metrics of Volstad shows some more glaring outliers this year for him shows that hitters are making more contact with his pitches this year and the number of swinging strikes and Ks are at an all time low.