MIAMI -- The Marlins made a series of roster moves prior to Sunday's homestand finale against the Brewers at loanDepot park, and ahead of a three-city, 10-game trip that begins on Monday in Arizona.

• Optioned left-hander Daniel Castano to Triple-A Jacksonville

• Transferred right-hander Jorge Guzman to the 60-day injured list

• Selected righty Luís Madero from Triple-A Jacksonville

Castano, recalled ahead of Saturday's 6-2 loss, lasted just four innings in his fourth start of the season. Miami has been unable to receive reliable production from the fourth and fifth spots in the rotation, with Elieser Hernandez and Sixto Sánchez sidelined. As a result, the club has been manipulating its starting staff based on off-days. The Marlins have used bullpen games twice, including in Wednesday's 8-0 win over the D-backs.

Guzman, who has been rehabbing from right elbow inflammation since Spring Training, is throwing at 105 feet with flat ground work. Though he made one relief appearance in the Majors in 2020, his last full season in '19 was spent in Double-A's rotation. The righty is nowhere close to contributing to the big league club.

• Marlins' injury timetables

That 40-man roster move freed up space for Madero, who has yet to debut in The Show. The 24-year-old right-hander previously spent time in the D-backs and Angels organizations. He allowed one run over 3 1/3 innings in an outing for Jacksonville, making him a prime candidate in long relief. Madero appeared just once in a Grapefruit League game, pitching a scoreless frame. His addition adds depth to the bullpen.

Honoring local work

Dr. Neha Goel was the Marlins' Honorary Bat Girl on Sunday, as part of MLB's annual effort each Mother’s Day to highlight extraordinary efforts to support the fight against breast cancer.

Goel is a triple-board-certified surgical oncologist and surgeon scientist at the University of Miami Miller School of Medicine-Sylvester Comprehensive Cancer Center. She leads cancer disparities outcomes research in the Division of Surgical Oncology, and serves as the institutional-PI for a multi-center collaboration of safety-net hospitals studying cancer care and outcomes at public hospitals to improve local and national cancer control and treatment efforts for vulnerable populations.

Goel received the news earlier in the week from Marlins reliever Richard Beleier, whose mother Kathleen was diagnosed with breast cancer a few years ago and underwent a double mastectomy. The pair bonded over that connection, speaking for 15 minutes on Zoom.

Invited as the club's special guest, Goel received Honorary Bat Girl gear, made the official “Play ball!” announcement and was recognized during the Marlins Impact Moment during the mid-fourth inning break on MarlinsVision.

"She's doing unique research on how breast cancer affects different ethnicities, and I think even just demographics in general -- if it's more prevalent in different cultures," Bleier said. "She's doing a lot of hard work on it. I'm glad that they're recognizing her."