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On 10 October 2019, Bivol was elevated to the status of full WBA (Super) light heavyweight champion, two days before his fight against Gilbert Lenin Castillo. On 12 October 2019, Bivol fought Gilbert Lenin Castillo on the undercard of Oleksandr Usyk vs. Chazz Witherspoon at the Wintrust Arena, Chicago. Bivol dropped his opponent in the sixth round with a counter right hand en route to a convincing unanimous decision victory, with scores of 119–108, 119–108, and 120–107. According to CompuBox, Bivol landed 188 of 652 total punches, connecting at a 29% rate, compared to Castillo, who was 98 of 429 (23%)
