Parker was once a heavyweight titleholder himself, picking up the vacant WBO belt in 2016 with a majority decision win over Andy Ruiz. Parker won defenses over Razvan Cojanu and Hughie Fury before losing a unification bout against Joshua in March 2018. Next came a second defeat, four months later against Dillian Whyte.
Parker then put together six consecutive victories, only to see his momentum brought to a halt in an 11th-round knockout loss to Joe Joyce in 2022. Since then, however, Parker has been on a very good run. He has notched five straight wins and taken full advantage of the opportunities afforded by so many heavyweight bouts being featured on Riyadh Season cards. Parker won a unanimous decision over Wilder in December 2023 and a majority decision over Zhang in June, bringing the 32-year-old New Zealander to 35-3 (23 KOs).