CC Sabathia is regarded as a terrific second-half pitcher, but that’s a bit of an inflated reputation — at least as a Yankee.

In his four years in pinstripes prior to this season, Sabathia posted a 3.25 ERA in 73 starts before the All-Star break and a comparable 3.18 ERA in 56 starts post-break.

“I think every start from here on out is going to be big,” Sabathia said before yesterday’s 5-2 win over the Red Sox.

Sabathia will make his first post-break start tonight, and after his last outing a week ago, he referred to his 4.07 ERA this season as “terrible.”

“I haven’t pitched [since],” he said yesterday. “So it’s still terrible and disappointing.”

Sabathia said one issue has been his arm angle being lower than it should be. Pitching coach Larry Rothschild explained that a low arm angle “causes the changeup to elevate and cut. Fastballs and two-seamers cut.” He said he has been attempting to stay on top during his release.