Hahn (elbow) underwent UCL "repair" surgery and he'll need at least six months until returning to action, Rustin Dodd of The Athletic Kansas City reports.

EDGE Analysis

Hahn had been rehabbing from a right UCL strain suffered in March, and he'd progressed to Triple-A Omaha prior to the procedure. If all goes well in his recovery process, Hahn will likely be ready for the beginning of spring training.

Hahn (elbow) transferred his rehab assignment to Triple-A Omaha on Tuesday. He faced three batters, striking out two and giving up a base hit.

EDGE Analysis

Hahn's rehab assignment had been shut down for more than a week before he returned to action Tuesday, but it's not clear if his absence was the result of a setback or pre-planned rest. In any case, Hahn has now made six appearances in the minors, covering no more than 1.2 innings in any of those outings. The light workloads suggest that Hahn, who has made all but three of his 53 appearances in the big leagues as starter, is likely being groomed for a bullpen role once he's activated from the 60-day disabled list.

Hahn (elbow) made the fifth appearance of his rehab assignment at Double-A Northwest Arkansas on Sunday, tossing 1.2 scoreless innings and conceding no hits and one walk.

EDGE Analysis

The 29-year-old has made 50 of his 53 career big-league appearances as a starter, but Hahn's usage thus far in his rehab suggests the Royals may be prepping him for a multi-inning relief role once he's reinstated from the 60-day disabled list. Hahn, who is working his way back from a UCL sprain suffered in spring training, has tossed no more than 31 pitches in any of his minor-league outings to date. Expect the Royals to keep him on the farm for nearly the entirety of his 30-day rehab window.

Hahn (elbow) will start a rehab assignment with the Royals' Rookie-League club Wednesday.

EDGE Analysis

Hahn missed the first half of the 2018 season due to a right UCL sprain that he suffered in early March. The right-hander will likely require a lengthy rehab assignment in the minors before working his way up to Kansas City. Over 14 appearances (13 starts) for Oakland last year, he logged a 5.30 ERA and 1.51 WHIP.

Hahn (elbow) could begin throwing bullpen sessions in the near future, Jeffrey Flanagan of MLB.com reports.

EDGE Analysis

Hahn was placed on the 60-day DL due to a right UCL sprain in early March, but he has been able to resume throwing and making gradual progress over the past couple weeks. There was a possibility that he would need Tommy John surgery if his elbow didn't show signs of improvement, though that doesn't seem necessary at the moment. Expect another update once Hahn begins to throw off the mound.

Hahn was placed on the 60-day disabled list with a right ulnar collateral ligament sprain, Rustin Dodd of The Kansas City Star reports.

EDGE Analysis

It's unclear how the injury cropped up or how severe it is, but it will keep Hahn on the shelf until at least the end of May, with Tommy John surgery a possibility if the issue doesn't improve. This is a tough break for the injury-prone 28-year-old, as he was looking to win a back-end spot in the Royals' starting rotation out of camp prior to suffering the injury. A more concrete timetable for his return should emerge once he's able to resume a throwing program. The move opens up a roster spot for Jon Jay, who was signed to a one-year deal Tuesday.

Hahn was traded to the Royals with Heath Fillmyer in exchange for Ryan Buchter and Brandon Moss, Jeffrey Flanagan of MLB.com reports.

EDGE Analysis

The 2017 season wasn't too kind to Hahn, who pitched 69.2 innings across 14 games, over which he pieced together a 5.30 ERA and 1.51 WHIP. His control was lacking, as he walked batters at an 8.5 percent rate. However, despite last season's struggles, it's expected that Hahn will compete for a spot in Kansas City's starting rotation during spring training, Rustin Dodd of The Kansas City Star reports.

Manager Bob Melvin said Hahn could be an option out of the bullpen in 2018, though he'll be stretched out as a starter, Susan Slusser of the San Francisco Chronicle reports.

EDGE Analysis

Hahn worked primarily as a starter for Oakland last season, starting 13 of his 14 appearances for the big club and posting a 5.51 ERA and 1.52 WHIP across those outings. He'll compete for an Opening Day role in the Athletics' rotation in 2018, though there's a chance he winds up in the bullpen if he struggles as a starter in spring.

Hahn was optioned to Triple-A Nashville on Sunday, Jane Lee of MLB.com reports.

EDGE Analysis

Hahn has failed to make it out of the third inning in his last two starts, surrendering a total of 16 runs (15 earned) on 15 hits in the process. The rough patch likely won't eliminate Hahn from consideration for rejoining the rotation in the second half, but for now, the Athletics will wait for him to right the ship in the minors before giving him another look. Hahn's demotion likely means that Paul Blackburn, who tossed six innings and gave up an unearned run in his MLB debut Saturday against the Braves, will stick around in the rotation for at least one more week.

Hahn (3-6) spotted the Astros six runs on nine hits over just two innings in Wednesday's 11-8 loss.

EDGE Analysis

He's now been annihilated for 16 runs (15 earned) over his last three innings -- a stretch that'll sink any pitcher's stat line. Hahn was delivering decent-enough work before this stretch, but even at his best, he's been far from a league-winning fantasy asset. It's still possible to utilize him as a streamer if you pick your spots carefully, but it may be wise to steer clear of Hahn until he bounces back.