Carlos Narvaez was the Red Sox’s cleanup hitter for Friday night’s series opener in the Bronx — his first trip there since the Yankees traded him to Boston in December.

On this version of the Yankees, you might be able to make a case that Weaver was the fourth-most important player. Such was the serenity/effectiveness that he brought to a pressure-packed job

Jorge Montanez breaks down the last week in saves and middle relievers on the rise in the latest closer report.

Headed to the injured list is right-handed relief pitcher Luke Weaver, who tweaked his hamstring while warming up in the bullpen on Sunday and was unable to pitch. Weaver was diagnosed with a left hamstring strain and is expected to miss four to six weeks of action.

The Yankees officially shifted Luke Weaver to the 15-day injured list for a hamstring strain that will require longer than those 15 days.

It goes without saying, but losing Weaver to the IL is a significant blow to the back of the Yankees’ bullpen. The closer — who was moved back to the ninth inning after Devin Williams’ shaky start to the year — has a 1.05 ERA with eight saves over 25 2/3 innings this season.

Yankees closer Luke Weaver has been placed on the 15-day injured list with a strained left hamstring sustained while warming up at Dodger Stadium last weekend, an injury that moves Devin Williams back into New York’s closer’s role.

PRP treatment gives Yankees pitcher hope for early return originally appeared on Athlon Sports. Yankees closer Luke Weaver is showing encouraging signs early in his recovery from a left hamstring strain. After receiving a PRP injection this week, Weaver resumed throwing Thursday and again before Friday’s series opener against the Red Sox.