O'Brien (calf) is scheduled to throw a bullpen session Tuesday, Jeff Jones of the Belleville News-Democrat reports.

It will be the first time O'Brien has thrown from the mound since he went down with a minor right calf strain a week ago. The injury is expected to prevent the reliever from pitching for Team South Korea in the World Baseball Classic, but O'Brien should not have trouble ramping up in time for Opening Day if he can avoid setbacks.

Bickford was shut down from throwing Tuesday due to a triceps strain, Chris McCosky of The Detroit News reports.

Bickford joined Detroit on a minor-league contract in January but is now dealing with an arm injury early in camp. The right-hander was already a longshot to crack the Opening Day roster, and the injury likely guarantees he'll open 2026 at the Triple-A level.

Holmes gave up two runs on one hit and two walks over 3.2 innings in the Mets' Grapefruit League game against the Blue Jays on Monday. He struck out three.

The right-hander threw 57 pitches (30 strikes) as he prepares to represent Team USA in the World Baseball Classic. Holmes' one real mistake came on an 82.2 mph curveball to Kazuma Okamoto, which the Japanese slugger put over the fence in center field for a two-run home run. It's a pitch Holmes didn't throw at all in 2025. Once he returns to camp from the WBC, Holmes will be battling with Kodai Senga for the fifth spot in the Mets' Opening Day rotation, although with only two days off through the first three weeks of their schedule, it's possible the team will roll with a six-man rotation out of the gate.

Stephenson (shoulder) said Tuesday he believes he'll be ready for Opening Day, Rhett Bollinger of MLB.com reports.

He threw another bullpen session Monday after showing up to camp behind schedule due to a nerve issue and thoracic outlet syndrome symptoms he experienced this offseason. It remains to be seen if Stephenson's stuff has suffered as a result of these physical issues, as he has not made his Cactus League debut yet.

Joyce (shoulder) will throw another bullpen session Wednesday, likely only throwing fastballs and changeups, Rhett Bollinger of MLB.com reports.

Joyce said Tuesday that his throwing progression is going well, but he's not yet ready to incorporate sliders into his routine. It's not clear whether he'll be ready in time for Opening Day, but he continues to make steady progress.

Ferrer was charged with the loss in Monday's Cactus League matchup with the Dodgers. He allowed two runs on three hits and a walk while striking out one in one-third of an inning.

It certainly wasn't the ideal start to the spring for Ferrer. The lefty struck out Andy Pages to open the frame before surrendering three straight hits, including a pair of doubles, followed by a walk and a wild pitch. The Mariners are hoping that Ferrer can shake off the rust before Opening Day, as he's expected to play a key role in the back end of their bullpen. Ferrer was traded to Seattle in December after posting a 4.48 ERA with a 1.27 WHIP and 71:16 K:BB across 76.1 innings with the Nationals in 2025.

Bender (shin) threw a live batting practice session Tuesday, Christina De Nicola of MLB.com reports.

Bender has been slowed early in Marlins camp by a shin issue, but he did not appear compromised Tuesday, sitting 95-96 mph with his fastball. The veteran reliever's next time on the bump could be in a game setting.

Kay developed a sinker while pitching with the Yokohama Bay Stars, Kade Heather of the Chicago Sun-Times reports.

Kay struggled to establish himself in the majors in partial seasons from 2019 through 2023, and he spent the last two seasons in the Nippon Professional Baseball League. He developed the sinker because his high fastball was less effective overseas, given that Japanese players typically have a flatter swing. Kay is now readjusting his approach in his return to MLB, where he previously relied primarily on his fastball, slider and changeup. He is set to make his first Cactus League start Tuesday, though it's unclear how much of his pitch mix he will show.

Megill had a PRP injection this offseason after missing time during the 2025 season due to a forearm strain, Todd Rosiak of The Milwaukee Journal Sentinel reports. Meanwhile, manager Pat Murphy suggested that he won't necessarily need defined roles for Megill and others at the back of the bullpen. "I don't feel like that at all," he said. "I feel like we'll look at the matchups and see what's best. We'll look at the health of the pitcher. You might see other guys in that mix too."

The Brewers' bullpen situation is especially tough to project, because they have so many different good options, even beyond Megill and Abner Uribe. Moreover, both Megill and Uribe are being priced in the draft market as near full-time closers. While their respective ratios and strikeouts mitigate some of the costs of missing out on saves, it's difficult to draft both and miss out on production at another position.

Burgos (forearm) is scheduled to make a relief appearance in Monday's Cactus League game against the Guardians, Jack Sommers of SI.com reports.

Burgos is healthy again and preparing to compete for a spot in the Diamondbacks' Opening Day bullpen after he closed the past season on the injured list due to a right forearm contusion. The 25-year-old reached the big leagues for the first time in 2025, making 13 appearances between stops with Seattle and Arizona and producing a 6.08 ERA and 1.88 WHIP over 13.1 innings.