Rondon signed a minor league contract with the Red Sox at the end of spring training, five days after getting released from Phillies camp, but the veteran reliever has now decided to call it quits at age 33. He finishes his playing career with a 3.49 ERA, 1.20 WHIP, and 441 strikeouts in 436 total MLB innings. He also tallied 92 saves.

Rondon was released by the Phillies last Thursday after exercising his late-March opt-out clause and has now found a new home. The veteran reliever could join the bullpen mix in Boston sometime in April.

Rondon had an opt-out clause in his minor league deal with the Phillies and exercised it on Thursday. The veteran reliever had surrendered seven runs -- six earned -- over seven innings of work this spring.

The Diamondbacks declined Rondon's $4 million club option for 2021 after he posted a rough 7.65 ERA in 23 relief appearances last season. However, he's not far removed from being a useful reliever, so the Phillies will see how he looks in camp.