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From last season to this season, Nova's ERA has dropped from 4.50 to 3.81—still not a great ERA, but definitely a vast improvement.
From the beginning of the season to now, Nova has greatly improved his control and composure on the mound. Earlier in the season, if he got into a jam, he would get flustered and lose control. Now, if Nova finds himself in a jam, he takes a deep breath and, more often than not, pitches his way out of it.
Also, in the past, Nova couldn't seem to get through the fifth or sixth inning. He would coast through the first 12 or 13 outs, and then hit a wall. But lately, he has been able to bust right through that wall, as he has pitched six or more innings seven out of his last 10 starts.
Nearly all facets of his game have improved throughout this season, and there is no reason he can't continue to get better.