[3][5][6][7] In 2014, Dalby gained two victories in the Cage Warriors, including a TKO stoppage of Sergei Churilov to earn the CWFC Welterweight Championship.
[8][9] Dalby made his promotional debut against Elizeu Zaleski dos Santos on 30 May 2015 at UFC Fight Night 67.
[14] Dalby was expected to face Bartosz Fabinski on 10 April 2016 at UFC Fight Night 86.
[15] However, on March 2, Fabiński was removed from the card due to undisclosed reasons and replaced by Zak Cummings.
[19] Despite struggling with depression and alcoholism stemming from unsuccessful UFC stint, Dalby racked up 3–1 (1 NC) record in Cage Warriors including winning interim Welterweight Championship.
[23] Dalby was scheduled to face Danny Roberts on 21 March 2020 at UFC Fight Night: Woodley vs.
[28] The fight result turned to no contest after Ronson received USADA handed 22 month suspension for testing positive for Metandienone.
[46] Dalby was scheduled to face Elizeu Zaleski dos Santos in a rematch on November 9, 2024 at UFC Fight Night 247.
[47] However, Dalby withdrew from the fight for unknown reasons and was replaced by promotional newcomer Zach Scroggin.