The Rockies selected Sullivan's contract from Triple-A Albuquerque on Wednesday.

Sullivan won the backup catcher job behind starter Hunter Goodman. He will get some starts on days Goodman serves as a designated hitter, but Sullivan will mostly operate as a reserve.

The White Sox placed Teel (hamstring) on the 10-day injured list Wednesday.

Teel went down with a Grade 2 right hamstring strain in mid-March while playing for Team Italy during the World Baseball Classic. The young catcher was given a 4-to-6 week timeline for recovery, and his progress so far suggests he has a chance to return closer to the front end of that timetable. While Teel is shelved, Edgar Quero and Reese McGuire will form Chicago's catching tandem.

The White Sox designated Lee for assignment Wednesday.

The White Sox elected to sign Reese McGuire this past weekend, which has pushed Lee off the roster. He's just a .193/.234/.321 hitter over parts of four big-league seasons, but there's a good chance Lee will find work soon from a club seeking catching depth.

The Diamondbacks placed Del Castillo on the 10-day injured list Wednesday due to a left calf strain.

Del Castillo was unable to make any Cactus League appearances after straining his left calf shortly before the start of camp, but he made enough progress in his recovery for Arizona to clear him to serve as a designated hitter in a minor-league spring training game earlier this week, per MLB.com. Arizona will likely want Del Castillo to be available to play catcher prior to activating him from the IL, and it's unclear how close the 26-year-old might be to taking part in defensive drills.

The Giants released Haase on Wednesday, Justice delos Santos of The San Jose Mercury News reports.

The 33-year-old was in camp as a non-roster invitee and hit well during spring training with a .911 OPS in 18 games, but the Giants will begin the year with Daniel Susac as the backup catcher to starter Patrick Bailey. Haase spent the past two seasons in Milwaukee and posted a .229/.289/.357 slash line across 77 plate appearances during the regular season last year.

Boston placed Seigler on the 10-day injured list Wednesday due to left knee patellar tendinopathy.

Acquired from the Brewers on Feb. 9, Seigler didn't end up making any appearances in spring training while recovering from a knee injury that first surfaced while he played in the Dominican Winter League during the offseason. The Red Sox haven't indicated where Seigler stands in his recovery, so the 26-year-old appears destined to miss more than the minimum 10 days. Seigler has two minor-league options remaining and could be sent out to Triple-A Worcester to play regularly once he's activated from the IL.

The Twins designated Jackson for assignment Wednesday, Aaron Gleeman of The Athletic reports.

Jackson was acquired via trade from the Orioles in November and signed to a one-year, $1.35 million contract. However, the Twins later signed Victor Caratini to serve as the backup catcher, making Jackson expendable. If he's not traded, Jackson will likely pass through waivers due to his contract and could accept an assignment to Triple-A St. Paul.

Atlanta placed Murphy (hip) on the 10-day injured list Wednesday.

Murphy's move to the IL was merely a formality after Mark Bowman of MLB.com reported at the onset of spring training that the veteran backstop would likely be out until sometime in May while completing his recovery from September surgery to address a right hip labral tear. Per MLB.com, Murphy was able to take on-field batting practice March 9, but it's not clear if he's taking part in defensive work or full baserunning yet. Drake Baldwin and Jonah Heim will open the season as Atlanta's two catchers.

Diaz went 1-for-2 with a pair of RBI in Tuesday's exhibition matchup against Triple-A Sugar Land.

Diaz is starting to warm up just in time after struggling for much of spring training -- the 27-year-old backstop finished Grapefruit League play with a .143/.226/.214 slash line, no homers and just two extra-base hits across 11 games. Still, Diaz should offer some upside at the catcher position after batting .256 with 20 homers, 70 RBI and a .701 OPS across 143 regular-season games in 2025.

Del Castillo (calf) is continuing to rehab and has begun running, Alex Weiner of Arizona Sports reports.

Del Castillo will operate as a designated hitter in minor-league games before the organization makes its next move. It's unclear what the Diamondbacks have in mind once Del Castillo is ready to play. He could serve as a third catcher and part-time DH in the majors or head back to the minors where he can continue to develop defensively.