Since April 15th when the Yankees closed the day at 7-5 they have gone 9-4 and this very good stretch has been, as discussed elsewhere, due to dominate starting pitching dominating.
While we have seen it with our own eyes and others have discussed it I went back and looked at the stats since Nova gave up five earned runs on just four hits in just 4 1/3 innings due to wild control (five walks, a wild pitch, and a hit batter) on that day versus the Rangers.
So what have the Yankees starting pitching done since that day? They have pitched 85 innings, given up 25 earned runs on 77 hits, allowed just 28 walks and struck out 66 batters.
Using sabermetric numbers this calculates to a 1.24 WHIP, 6.99 K/9, 2.96 BB/9, 2.36 K/BB and an ERA of 2.65.
For an in-team comparison CC Sabathia has over his career the following stats 1.22 WHIP, 7.6 K/9, 2.8 BB/9, and an ERA of 2.70. So basically over their last 13 games the Yankees have had starting pitching just a tad worse overall than what their #1 starter has had over his entire career. Pretty impressive indeed.
Looking at this on a league wide basis if compared to AL pitchers overall, going into play today, the Angels had the best WHIP at 1.17, the Jays the best K/9 ratio at 7.62, the Twins the best K/BB ratio at 1.64 and Oakland with the best team ERA at 2.79. The Yankees starting pitching, over the last 13 games, if compared to the rest of the league for the season as a whole would be tied for third in WHIP, would be sixth in K/9, and first in ERA. Admittedly the better comparison would be the Yankees starting pitching versus other teams starting pitching over the last 13 games but this is all I am doing for this post.
While there are reasonable questions that this dominate starting pitching will continue to dominate the way it has it is something that Yankees fans can be very pleased with to date.