What Dellin Betances learned from watching Chad Green

BOSTON — Dellin Betances listed some of his career highlights on Thursday, like being at Fenway Park for Derek Jeter’s final game or Yankee Stadium when Mariano Rivera pitched for the last time. But at the top, now, is what Betances did in Wednesday’s wild-card victory over the A’s in The Bronx. The right-hander, who…