Castillo, activated from the injured list earlier in the day, recorded his fifth hold in a win over the Yankees on Wednesday, firing a perfect eighth inning during which he recorded a strikeout.

EDGE Analysis

Castillo was sharp in his return, firing eight of his 13 pitches for strikes to serve as an effective bridge to Paul Sewald in the ninth inning. The veteran right-hander, who was seeing his first game action since July 25, now boasts a 4-0 record, 1.32 ERA, two saves and four holds over the 13.2 innings covering his last 14 appearances.

The Mariners reinstated Castillo (shoulder) from the 15-day injured list Wednesday.

EDGE Analysis

Lefty reliever Brennan Bernardino was sent to Triple-A Tacoma to clear a spot in the bullpen and on the 26-man active roster for Castillo, who had been on the shelf since July 28 with right shoulder inflammation. Castillo had a rocky rehab appearance with High-A Everett on Sunday -- he was charged with five runs (four earned) on three hits and a walk while recording only two outs -- so the Mariners could ease him back into the mix as a low-leverage reliever. Assuming Castillo quickly displays a return to form, he should re-enter the Mariners' late-inning picture and potentially factor into save situations, just as he did prior to landing on the IL.

Castillo (shoulder) is set to begin a rehab assignment in coming days with High-A Everett, Daniel Kramer of MLB.com reports.

EDGE Analysis

Castillo has been on the shelf since July 28, with his stint retroactive to two days prior. The right-hander reliever will likely only need a couple of rehab appearances before being deemed ready for activation, and he'd be eligible to return as soon as Wednesday.

Manager Scott Servais said Thursday that he expects Castillo (shoulder) to return after missing the minimum of 15 days, Shannon Drayer of 710 ESPN Seattle reports.

EDGE Analysis

Castillo landed on the 15-day IL with right shoulder inflammation Thursday, but the issue doesn't seem to be a significant concern. Servais said the right-hander would likely be able to return after 5-6 days, but the Mariners elected to place him on the IL to avoid a shorthanded bullpen. Andres Munoz and Matt Festa will likely see increased high-leverage chances ahead of closer Paul Sewald while Castillo is sidelined.

Castillo was placed on the 15-day injured list with right shoulder inflammation Thursday, retroactive to July 26.

EDGE Analysis

Castillo wasn't particularly sharp Monday against the Rangers, allowing a run on two hits and a walk while striking out one in one-third of an inning, and it's possible the injury contributed to his struggles. The 28-year-old missed a week and a half last year due to shoulder inflammation, but it's not yet clear whether he'll be able to return following a minimal IL stint this time around. Castillo's seven wins this year rank second among all relievers, while he's converted all six of his save chances with four holds. Paul Sewald should see the majority of the closing duties with Castillo sidelined, while Andres Munoz and Matt Festa could also take on additional high-leverage work.

Castillo (7-1) recorded the win in an extra-inning victory over the Rangers on Saturday, firing a scoreless ninth inning during which he issued a walk and recorded a strikeout.

EDGE Analysis

The veteran right-hander was rewarded for preserving a 2-2 tie and sending the game into extras when J.P. Crawford knocked in Sam Haggerty with what would turn out to be the game-winning run in the top of the 10th inning. Castillo is in the midst of a dominant stretch of pitching, as Saturday's appearance was his seventh consecutive of the scoreless variety and 10th blanking in the last 11 trips to the mound overall.

Castillo allowed a hit and an intentional walk and struck out one in a scoreless inning to earn the save in Thursday's 6-5 win over the Rangers.

EDGE Analysis

Paul Sewald saved both games of Wednesday's doubleheader sweep over the Nationals, so he was not available Thursday. Castillo was a little shaky in putting two runners aboard, but he ended the threat when he got Adolis Garcia to fly out. Castillo hasn't allowed a run in his last 6.1 innings, though he's given up five hits and five walks in that span. He's up to six saves, three holds and a 6-1 record while adding a 3.93 ERA, 1.28 WHIP and 34:15 K:BB through 34.1 innings. The right-hander should continue to serve as a setup man, and he's the favorite to get the occasional save chance when Sewald's unavailable.

Castillo allowed two hits and walked one in a scoreless inning to earn the save in Saturday's 2-1 win over the Blue Jays.

EDGE Analysis

Paul Sewald was asked to get five outs Friday and was unavailable Saturday, leaving the closing duties to Castillo. This was a shaky showing as the right-hander loaded the bases with two outs, but he got Matt Chapman on a groundout to escape the jam unscathed for his first save since June 8. Castillo's allowed three runs (two earned), eight hits, five walks and a hit batter while striking out 15 in 16 innings since the start of June, but Sewald's been even sharper, leaving the former in a setup role for now. Castillo is up to five saves with two holds, a 6-1 record, a 4.22 ERA, 1.28 WHIP and 32:13 K:BB through 32 innings overall.

Castillo (5-1) recorded the win in a victory over the Orioles on Tuesday, firing a scoreless eighth inning during which he hit a batter and recorded a strikeout.

EDGE Analysis

Castillo played his setup role to near perfection, plunking Robinson Chirinos but still working out of the frame unscathed to preserve a scoreless tie at the time. Castillo was then rewarded for his 12th scoreless effort in his last 13 appearances when Jesse Winker plated a pair of runs with a double in the home half of the frame. Castillo is now 4-1 over his last five decisions, and his ERA (4.67) and WHIP (1.15) sit at their lowest figures since April 30 and April 24, respectively.

Castillo (4-1) fired a perfect eighth inning in a win over the Athletics on Thursday, recording two strikeouts.

EDGE Analysis

The veteran reliever prevented the Mariners' 1-0 deficit from growing during his ultra-sharp frame, one in which he threw eight of 11 pitches for strikes. Castillo was then rewarded for his 10th scoreless effort in the last 11 appearances with his fourth win when the Mariners went ahead on two wild pitches in the top of the ninth and Paul Sewald slammed the door on the Athletics in the home half of the final frame. Castillo had allowed two runs (one earned) in his previous outing Saturday against the Angels, but he's largely righted the ship after a rocky first month-plus of the season by posting 3-1 record, three saves, one hold, a 1.88 ERA and 0.49 WHIP over his last 14.1 innings.