Jansen struck out two in a perfect inning Saturday to notch his sixth save of the season in a 4-2 win over the Nationals.

Jansen, who hasn't pitched the last six days, will be used in Sunday's game, Peter Abraham of The Boston Globe reports.

Jansen (1-0) got the win over the Cubs on Sunday, pitching a perfect inning while striking out a batter in the process.

Jansen gave up a run on three hits in the ninth inning Tuesday, blowing his first save of the season in a 10-7 extra-innings loss to the Guardians.

Jansen struck out one batter in a perfect ninth inning and earned a save over the Angels on Friday.

Jansen's velocity is down close to three mph on his cutter thus far, Julian McWilliams of The Boston Globe reports.

Jansen (back) is available to pitch Monday against the Athletics, Christopher Smith of The Springfield Republican reports.

Red Sox manager Alex Cora said Jansen (back) is still being evaluated ahead of Sunday's series finale against the Mariners, and the closer's availability has yet to be determined, Ian Browne of MLB.com reports.

Jansen (back) felt good after his Grapefruit League appearance Thursday and expects to be ready for Opening Day, Mac Cerullo of the Boston Herald reports.

Jansen (back) threw one scoreless inning without allowing a baserunner in Thursday's Grapefruit League game against the Orioles,Pete Abraham of The Boston Globe reports.