Del Castillo (back) is 5-for-17 with three walks and two runs scored in four games with Triple-A Reno since being activated from the 7-day injured list Tuesday.

Del Castillo landed on the 7-day injured list June 20 due to lower back discomfort but was only shut down for one week before gaining clearance to embark on a rehab assignment. He's batting .294 with two home runs, eight RBI and 10 runs through nine appearances this season for the Aces.

Millas is expected to be called up from Triple-A Rochester on Tuesday, Andrew Golden of The Washington Post reports.

Millas is set to join the Nationals in St. Louis ahead of the team's three-game set with the Cardinals beginning Tuesday. The catcher was sent down to Triple-A on Friday, but he'll make a quick return to the big-league roster. It's unclear who will be displaced from Washington's roster in a corresponding move.

Herrera is out of the lineup for Monday's game against the Padres.

Herrera and James McCann have now made four starts apiece behind the plate over the Diamondbacks' last eight games, but the playing time could eventually tilt in the latter catcher's favor. Since he signed with Arizona on June 23, McCann has posted a 1.259 OPS over five games, while Herrera has slashed just .176/.300/.176 over that same period.

Bart is out of the lineup for Monday's game against the Royals.

After starting behind the dish in the Pirates' first two games of the weekend series in Seattle, Bart sat out Sunday's 1-0 loss, and he'll remain on the bench for Monday's opener in Kansas City while Henry Davis gets another nod at catcher. Batting just .211 with no extra-base hits since returning from the injured list June 17, Bart may have to settle for a timeshare with Davis until his bat begins to heat up.

Murphy went 2-for-4 with a double and a solo home run in Sunday's loss to the Orioles.

The backstop was the only Atlanta hitter to have much success against Trevor Rogers and the Baltimore bullpen, accounting for his team's only extra-base hits and its only run with his ninth-inning shot off Seranthony Dominguez. Murphy has gone yard four times in his last seven games, batting .318 (7-for-22) over that impressive span with two doubles and nine RBI. As a result, the playing-time split between him and rookie Drake Baldwin may be tipping Murphy's way heading toward the All-Star break.

McGuire went 2-for-5 with a run scored and two RBI in Sunday's 11-0 win over the Cardinals

McGuire picked up a start in place of Carson Kelly in the series finale, and the former delivered his first multi-hit performance since June 10. While McGuire is batting just .237 with a .262 on-base percentage, he has provided some degree of fantasy utility by tallying five home runs, 10 RBI and 10 runs scored in only 18 games so far this season, though his ceiling is certainly limited due to his backup role. The veteran catcher is best viewed as a DFS dart throw on days when he's in the lineup.

Brantly (lat/knee) was cleared to resume his rehab assignment at Triple-A Jacksonville on Sunday, Kevin Barral of FishonFirst.com reports.

Brantly didn't end up playing Sunday after Jacksonville's game against Charlotte was rained out, but the veteran catcher seems to be healthy again after left knee inflammation caused him to be pulled off his previous assignment with the Triple-A club about three weeks ago. The 35-year-old was initially placed on the injured list April 21 due to a right lat strain, though that injury no longer appears to be much of a concern. Once he completes his rehab assignment, Brantly could be activated from the 60-day IL and designated for assignment, as the Marlins are already carrying three catchers (Agustin Ramirez, Nick Fortes and Liam Hicks) on the 26-man active roster and wouldn't appear to have room for him.

Arizona manager Torey Lovullo said Sunday that Moreno (finger) has resumed running on the bases and working on receiving, MLB.com reports.

Lovullo noted that Moreno hasn't yet been cleared to use his dominant hand after suffering a hairline fracture to his pointer finger back on June 6, so until the catcher is cleared to start throwing and hitting, his return from the 10-day injured list shouldn't be viewed as imminent. Moreno appears likely to remain out until around late July, leaving Jose Herrera and James McCann to handle catching duties for Arizona over the next few weeks.

Bailey is not in the starting lineup for Sunday's contest against the Athletics.

Bailey will take a seat after he went 1-for-8 with a double, a run scored and five strikeouts over the first two games of the team's series with the A's. Andrew Knizner will draw the start behind the plate and bat ninth in the series finale.

Kelly is out of the lineup for Sunday's game against the Cardinals.

Reese McGuire will step in behind the plate while Kelly rests after starting in five of the previous six games. After falling into a 4-for-44 rut at the plate over a three-week stretch from late May to mid-June, Kelly has heated back up, slashing .389/.452/.694 with two home runs, seven RBI and six runs over his last 11 games.