Sources - Wilder-Zhang, Dubois-Hrgovic bouts close for June 1 - ESPN

A pair of heavyweight clashes between four top-10 contenders are nearly done deals.

Hard-hitting Deontay Wilder and Zhilei Zhang, No. 7 and No. 6 respectively in ESPN's heavyweight rankings, are in the process of finalizing a deal for a June 1 clash in Riyadh, Saudi Arabia, sources told ESPN.

Additionally, Filip Hrgovic, ranked No. 5, and No. 9 Daniel Dubois, are also finalizing a deal to square off that evening, sources added.

The two heavyweight bouts are scheduled to take place on the undercard of the highly-anticipated showdown between Artur Beterbiev and Dmitry Bivol for the undisputed light heavyweight championship.

Wilder and Zhang will both enter the ring in desperate pursuit of a victory to remain relevant in boxing's glamour division. Both fighters are reeling from decision losses to Joseph Parker in Riyadh. The former heavyweight titleholder pulled off a major upset in December with a wide-points win over the American that spoiled plans for a long-awaited matchup between Anthony Joshua and Wilder.

Joshua went on to brutally knock out Francis Ngannou instead, and on that undercard earlier this month, Parker scored another upset with a decision win over Zhang, who floored Parker twice in the bout but was otherwise outboxed.

Rather than take the usual boxing journey of comeback bouts, Wilder and Zhang will now head into a high-stakes bout that will position the winner for another marquee heavyweight bout. Two weeks earlier, Tyson Fury and Oleksandr Usyk will vie for the undisputed heavyweight championship on May 18 in Riyadh.

Wilder (43-3-1, 42 KOs) is one of the division's all-time biggest punchers. But the fighter from Alabama has lost three of his past four bouts. Two of those losses came in the championship