As Morosi noted, the southpaw has proved to be pretty comfortable in Boston when he's pitched there: "Happ, 38, has thrown more innings at Fenway [66.2] than any ballpark he has not called home—and he has a 2.57 ERA in his career there."
Boston won't be alone in its reported pursuit of Happ, as Morosi previously noted:
Happ went 2-2 for Boston's hated rivals, the New York Yankees, in 2020, finishing with a 3.47 ERA, 1.05 WHIP and 42 strikeouts in 49.1 innings (nine starts). He made just one relief appearance for the team in the postseason, however, giving up four runs in 2.2 innings.
The Yankees declined Happ's $17 million option for the 2021 season, which also would have vested had he made 10 starts or 61.1 innings. Happ wasn't thrilled that he wasn't able to hit either of those benchmarks.
"I think you guys are smart enough," Happ told reporters in August when asked about his limited usage by the Yankees during the season, essentially implying the team was manipulating his workload to keep his option from vesting. "I'll let you guys answer that. I think it's fairly clear."
General manager Brian Cashman pushed back against that narrative.
"Under the most recent circumstance where [Happ] obviously publicly complained ... He had a poor season last year, and he's gotten out of the gate not very successful for us this year," he said, per Randy Miller for NJ.com. "Ultimately, Aaron Boone and [pitching coach] Matt Blake on the pitching side [make the call on starts and innings]."
All of this is to say that a reunion between Happ and the Yankees isn't going to happen. Enter the Red Sox, who could use an upgrade in the rotation after injuries and inexperience hampered the starting pitchers in 2020 en route to a 5.58 team ERA (28th in MLB), 1.60 team WHIP (30th) and .281 batting average against (30th).
In turn, the Red Sox finished 24-36. Upgrading the rotation is Boston's major priority this offseason.