Fitts left Monday's game against the Orioles with an apparent arm injury, Christopher Smith of MassLive.com reports. He allowed three runs on two hits and three walks while striking out six over four innings before exiting.

Fitts came back out for the sixth inning but was removed after tossing one pitch. He'll presumably be taken to the clubhouse to be evaluated further. Steven Matz was called upon to replace Fitts.

Mahle (shoulder) recently resumed throwing off a mound and could advance to throwing live batting practice in the near future, Evan Grant of The Dallas Morning News reports.

Grant noted that Mahle hasn't been cleared to throw breaking pitches during his bullpen sessions, so he'll need to make use of his full arsenal before he eventually advances to facing live hitters and then heads out on a rehab assignment. Mahle had turned in a 2.56 ERA and 1.13 WHIP in 77 innings over his 14 starts prior to landing on the injured list June 15 due to right shoulder fatigue. He still has a realistic chance at returning before the end of the season, but he may not have sufficient time to get fully stretched out for a starting role and could wind up pitching out of the bullpen.

Severino (oblique) will throw a simulated game Wednesday, Martin Gallegos of MLB.com reports.

Severino continues to work his way back from a left oblique strain, which resulted in him being placed on the 15-day injured list Aug. 9. The veteran right-hander has apparently responded well to throwing bullpen sessions, so he'll take the next step forward in his recovery by facing hitters Wednesday. The Athletics will evaluate Severino following the sim game before determining whether he's ready to re-enter the big-league rotation next week, or if he'll first require a minor-league rehab start before being activated from the injured list. Severino posted a 6-11 record with a 4.82 ERA and 1.34 WHIP across 136.1 innings prior to landing on the IL.

The Athletics announced Monday that Lopez has been diagnosed with a Grade 1 flexor strain in his left forearm and has been shut down from throwing, Martin Gallegos of MLB.com reports.

Lopez was lit up for nine earned runs on six hits and six walks over two innings during his start in Sunday's 11-4 loss to the Mariners, with the Athletics revealing after the outing that the southpaw was battling forearm tightness. After undergoing an MRI, Lopez now has an official diagnosis of his injury, and manager Mark Kotsay said that the 27-year-old will be officially moved to the 15-day injured list Tuesday. The Athletics are hopeful that Lopez will be able to return at some point before the end of the season, even if it means he's working in a bullpen role, according to Gallegos. Joey Estes pitched in long relief of Lopez on Sunday and is the most likely candidate to enter the rotation as Lopez's replacement during the Athletics' series against the Rangers this coming weekend.

Gasser (elbow) struck out four batters and allowed two earned runs on three hits and two walks across 4.2 innings in a rehab start Sunday with Triple-A Nashville.

Gasser has now made eight starts in the minors since beginning his rehab assignment July 19 in the rookie-level Arizona Complex League. Though pitchers are typically allotted just 30 days of rehab time in the minors while on the injured list, pitchers like Gasser who are returning from Tommy John surgery are eligible for up to three consecutive 10-day extensions, and the Brewers appear to have taken advantage of that rule to give the right-hander some additional ramp-up time. Since shifting his assignment to Nashville on Aug. 8, Gasser has turned in a 1.98 ERA over 13.2 innings in four starts, but his other ratios (1.32 WHIP, 12:6 K:BB) aren't quite as shiny. Milwaukee will likely continue to allow Gasser to work as a starter during his rehab assignment, but if he rejoins the big club over the final five weeks of the season, he would presumably work out of the bullpen, unless injuries test the organization's starting depth.

The Brewers optioned Patrick to Triple-A Nashville on Monday.

Patrick was called up to start the Brewers' series finale versus the Giants on Sunday, when he came away with the no-decision in a 4-3 loss after allowing two runs on four hits and two walks while striking out seven across 5.1 innings. Though the right-hander will head back to Triple-A, he could be a candidate to make additional starts for the Brewers in September if the team loses another rotation member to an injury.

The Brewers recalled Myers from Triple-A Nashville on Monday.

Myers has allowed just one unearned run with a 10:0 K:BB over 10 innings during his six relief outings in the majors this season. He will be deployed as a multi-inning reliever with the Brewers.

The Angels placed Anderson on the paternity list Monday.

Anderson is currently slated to start Wednesday's game against the Rangers, but it's not clear whether he will still take the ball that day or get pushed back in the pitching schedule as he welcomes a new baby. The lefty is winless over his last 21 starts, posting a 5.25 ERA over that stretch.

Megill (elbow) will make another rehab start with Triple-A Syracuse on Thursday, Mike Puma of the New York Post reports.

The Mets had left open the possibility that Megill would return from the 60-day injured list and rejoin their rotation Friday against the Marlins, but they've elected to give the right-hander one more rehab start in order to extend his pitch count to around 80. Working his way back from a sprained UCL in his right elbow, Megill has been superb in three rehab outings between Syracuse and Double-A Binghamton, spinning 10 scoreless frames with a 17:2 K:BB.

Weathers (lat) is expected to make a three-inning rehab start Saturday, Daniel Alvarez-Montes of ElExtraBase.com reports.

If all goes well Saturday, Weathers is expected to make another start in the minors after that before returning from the 60-day injured list and slotting back into the Miami rotation before the middle of September. Weathers has been on the shelf since early June due to a strained left lat. The southpaw has been limited to just five starts for the Marlins this season but has collected a 3.28 ERA and 23:8 K:BB across 24.2 innings.