World Bantamweight Champion from 1925 to 1927, Charlie Phil Rosenberg won his title on March 20, 1925, in New York City, decisioning Eddie Martin in 15 rounds.

In order to make weight for the title fight, the 5'4" Rosenberg had to lose 39 pounds in 10 weeks. He remained champion until February 4, 1927, when he was forced to relinquish his crown because he could not make the division’s legal weight in a title defense against contender Bushy Graham. The fight went on as scheduled, and Rosenberg won a 15-round decision.

Rosenberg fought only two more matches, winning both—including a victory over former Featherweight Champion Johnny Dundee—before deciding to retire.

His professional record: 65 bouts— won 33 (7 KOs), drew 8, lost 17, 7 no-decisions.