Tampa Bay Rays Zombro was not selected in the
2017 Major League Baseball draft. He made one appearance for the
Gulf Coast Rays of the
Rookie-level Gulf Coast League and spent the rest of the season with the
Princeton Rays of the Rookie-level
Appalachian League, making 13 appearances for Princeton. In 2018, Zombro pitched for the
Bowling Green Hot Rods of the
Single-A Midwest League, and he had an 8–2 record and a 2.84 ERA, paired with 54 strikeouts against eight
walks in 76 innings pitched. He had a 2–0 record, a 1.87 ERA, and 11 saves, while striking out 53 and walking seven in innings for Montgomery, The Rays invited Zombro to
spring training in 2020 as a non-roster player, but the 2020 season was cancelled due to the
COVID-19 pandemic. Zombro received a non-roster invitation to spring training with the Rays in 2021, and he returned to Durham for the 2021 season. Zombro was taken off the field on a stretcher and brought to
Duke University Hospital for surgery to repair a
skull fracture. Zombro spent four days in the
intensive care unit and another two days being monitored before he was discharged from the hospital on June 9. He has no memory of the incident. After his discharge from the hospital, Zombro underwent
physical therapy,
speech therapy, and
occupational therapy. A
CT scan performed in December 2021 showed that the fracture had completely healed, clearing Zombro to return to baseball. He is wearing protective head gear made from
kevlar under his
baseball cap, with a small piece that sticks out to cover his
zygomatic bone. The Bulls added him to their active roster on April 21. Zombro appeared in his first game since the injury on April 24, pitching a scoreless inning in relief for Durham against Norfolk. In June, Zombro had surgery to correct
thoracic outlet syndrome, ending his 2022 season. Zombro was released by the Rays organization on March 26, 2023.
Texas Rangers On May 19, 2023, Zombro signed a minor league contract with the
Texas Rangers organization, and was assigned to the
Triple-A Round Rock Express. He made two scoreless appearances for the Triple–A
Round Rock Express and became a free agent following the season on November 6. On November 22, 2023, Zombro re-signed with the Rangers on a new minor league contract. He did not appear in a game during the 2024 season, as he was dealing with "consistent nerve issues," and he announced his retirement over
social media on August 23, 2024. ==Coaching career==