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Butler was booked to fight Jonas Sultan on 22 April 2022, at the M&S Bank Arena in Liverpool, England for the vacant WBO interim bantamweight title. Butler was originally scheduled to challenge WBO bantamweight champion John Riel Casimero in 11 December 2021 and 22 April 2022, before Casimero withdrew before the weigh-ins due to gastritis, and not being permitted by British Boxing Board of Control (BBBofC) due to medical guidelines violation, respectively. Sultan was ranked #10 by The Ring, #4 by the WBA, #4 by the WBO and #12 by the IBF at bantamweight. Butler captured the vacant title by unanimous decision, with scores of 116–112, 117–111 and 117–111, utilizing out-fighting tactics to control the fight for the majority of the bout. On 4 May, the WBO officially stripped Casimero of the full title and elevated Butler from interim to full champion
