Oleksandr Usyk was heavier Friday for the biggest bout of his career than any of his first 18 professional fights.

Anthony Joshua still outweighed him by nearly 19 pounds at O2 Arena in London.

The 6-feet-6 Joshua stepped on the British Boxing Board of Control’s scale at 240 pounds for their 12-round heavyweight title fight Saturday night in London. Joshua was slightly lighter than the 240¾ pounds he weighed for his prior appearance – a ninth-round knockout of Bulgaria’s Kubrat Pulev on December 12 at Wembley Arena in London.

The 6-feet-3 Usyk came in at a career-high 221¼ pounds. Usyk was exactly four pounds heavier than he was for his previous fight – a 12-round, unanimous-decision win against England’s Dereck Chisora last October 31 at Wembley Arena.

Caesars Sportsbook lists Joshua as nearly a 3-to-1 favorite over the undefeated Usyk entering their fight for Joshua’s four heavyweight titles. Joshua-Usyk is expected to attract a capacity crowd of nearly 70,000 to Tottenham Hotspur Stadium.

Joshua (24-1, 22 KOs) will defend his IBF, IBO, WBA and WBO titles versus Usyk, a highly skilled southpaw who won the heavyweight gold medal at the 2012 Summer Olympics in London. Usyk (18-0, 13 KOs) is a former undisputed cruiserweight champion who will take his toughest test in the heavyweight division against an opponent who won the super heavyweight gold medal at the 2012 Summer Olympics.

Joshua, 31, and Usyk, 34, will headline Sky Sports Box Office’s pay-per-view show in the United Kingdom and Ireland (6 p.m. BST; £24.95). DAZN will stream the Joshua-Usyk card in the United States (1 p.m. EDT) and more than 170 additional countries and territories.

The official weights for the Joshua-Usyk undercard fights are listed below.

Lawrence Okolie (16-0, 13 KOs), London, 199 pounds vs. Dilan Prasovic (15-0, 12 KOs), Herceg Novi, Montenegro, 200 pounds, 12 rounds for the WBO cruiserweight title.

Campbell Hatton (3-0, 0 KOs), Hyde, England, 136¾ pounds vs. Sonni Martinez (2-4, 0 KOs), Montevideo, Uruguay, 136 pounds, 6 rounds, lightweights.

Callum Smith (27-1, 19 KOs), Liverpool, England, 175 pounds vs. Lenin Castillo (21-3-1, 16 KOs), Santo Domingo, Dominican Republic, 175 pounds, 10 rounds, light heavyweights.

Maxim Prodan (19-0-1, 15 KOs), Novoselytsia, Ukraine, 146¾ pounds vs. Florian Marku (8-0-1, 6 KOs), Lushnje, Albania, 147½ pounds, 10 rounds, welterweights.

Chris Ousley (12-0, 9 KOs), Chicago, 160 pounds vs. Khasan Bayasangurov (21-1, 11 KOs), Kiev, Ukraine, 159½ pounds, 10 rounds, middleweights.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.