WBA, WBO, IBF and IBO world heavyweight champion Oleksandr Usyk (20-0, 13 KOs) retained the title of the best boxer in the world, regardless of weight category, according to The Ring.

The Ukrainian owns a championship belt according to an authoritative publication and remains at the top of the list of heavyweights, as well as all the boxers in the world..

In addition, the top ten includes Ukrainian boxer Vasily Lomachenko, who on May 20 will fight against Devin Haney for the title of undisputed world lightweight champion..

Top 10 The Ring, regardless of the weight category:.

Oleksandr Usyk (20-0, 13 KOs).

Naoya Inoue (24-0, 21 KOs).

Terence Crawford (39-0, 30 KOs).

Errol Spence (28-0, 22 KOs).

Saul Alvarez (58-2-2, 39 KOs).

Dmitry Bivol (21-0, 11 KOs).

Vasily Lomachenko (17-2, 11 KOs).

Josh Taylor (19-0, 13 KOs).

Jermall Charlo (35-1-1, 19 KOs).

10. Juan Francisco Estrada (44-3, 28 KOs).

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Previously, Usyk announced the approximate date of the fight with the British challenger Daniel Dubois.