In his 11 seasons across the Korean and Japanese professional leagues, Rockies reliever Seunghwan Oh dominated with a 1.81 ERA and 357 saves to cement his “Final Boss” nickname.

But Oh, now in his fourth major league season, is struggling worse than ever. He had a 2.78 career MLB ERA coming into 2019, but entering play Friday his season ERA was 7.90 in 15 appearances.

“The problem is elevated pitches, especially the fastball,” Rockies manager Bud Black said. “He’s going to pitch up in the zone a little bit — that’s what he does — but he’s got to incorporate the low fastball as well.

“And the secondary pitches are up a little bit, too. They’re not quite as crisp as we’ve seen in the past … He’s throwing strikes, but they’re not consistently quality strikes.”

To get out of his funk — which Oh admitted “couldn’t be worse right now” — the 36-year-old who has made his name from being even-keeled under pressure on the diamond is staying measured and calm off it.

Plus, he hasn’t forgotten about his success last season after coming over to Colorado via trade with Toronto. Oh posted a 2.53 ERA in 21.1 innings down the stretch for the Rockies.

“I have to adjust (my location), but I don’t think there’s anything else major, to be honest,” Oh said. “I’m trying to focus on my mind and my heart, and that’s probably what’s going to help me get out of this.”

Southpaw relievers in Triple-A. Both Jake McGee (left knee sprain) and Chris Rusin (back strain) are going to throw for the Isotopes again on Saturday as part of their rehab assignments. On Thursday McGee gave up one hit in a scoreless inning in his first appearance with Albuquerque, while Rusin was hit for two runs in an inning in his second appearance.

Freeland’s pause. Among the numerous technical tweaks Black, pitching coach Steve Foster and Kyle Freeland are making to the southpaw’s delivery amid early-season scuffles is a re-evaluation of the pause he induced in his windup last season.

“There’s been a little bit of discussion about how long he stays over the rubber in that balance point, when you see him pause a bit,” Black said. “There’s some talk of looking at old video to see what the balance is there as far as that hesitation, and also how he separates the ball out of his glove and gets his arm going.”

On Deck

Padres LHP Joey Lucchesi (3-2, 5.00 ERA) at Rockies RHP Jon Gray (3-3, 4.22)

6:10 p.m. Saturday, Coors Field

TV: AT&T SportsNet

Radio: 850 AM; 94.1 FM

After getting bumped from his last start due to a postponement, Gray retakes the mound looking to regain the momentum he had from April 11 through April 27, when the right-hander allowed just three earned runs in 19.2 innings across three starts. Outfielder Wil Myers has had the most success against Gray of any San Diego player, batting .393 (11-for-28) with two home runs. Meanwhile, Lucchesi has been hit-and-miss this season, and was hit for three runs in five innings against the Dodgers last week. Colorado lit him up on April 15 for five runs in seven innings at Coors Field, when Ian Desmond and Nolan Arenado each took him deep.

Trending: With his solo homer in the first inning of Colorado’s win over San Francisco on Thursday, Mark Reynolds is sitting at 298 career homers. With two more long balls, he’ll pass Angels outfielder Tim Salmon (299) as the player with the most homers in major league history without an all-star nod.

At issue: When the Rockies’ pitching implodes, it tends to implode in a big way. Colorado’s allowed 10 or more runs in five games this season.

Upcoming pitching matchups

Sunday: Padres LPH Nick Margevicius (2-3, 3.47) at Rockies RHP Antonio Senzatela (2-2, 5.67), 1:10 p.m., ATTRM

Monday: Off

Tuesday: Rockies LHP Kyle Freeland (2-5, 5.84) at Red Sox LHP Chris Sale (1-5, 4.50), 5:10 p.m, ATTRM

Wednesday: Rockies RHP German Marquez (3-2, 3.46) at Red Sox LHP Eduardo Rodriguez (3-2, 5.40), 5:10 p.m., ATTRM