There are weigh-ins and there are weigh-ins. This was the latter.

Defending IBF welterweight titleholder Kell Brook and mandatory challenger Errol Spence Jr. have weighed in ahead of Saturday’s eagerly anticipated showdown, which takes place at Bramall Lane soccer stadium in Sheffield, England.

Tensions were high when hard-hitting American Spence (21-0, 18 knockouts) hit the scales and weighed in at 146.5 pounds. The 27-year-old southpaw, who is highly-touted, looked to be in spectacular fighting shape ahead of his first world title bout.

All eyes were on Brook, however, who is returning to the 147-pound limit after having campaigned at 160, in a losing effort to Gennady Golovkin, last September. Many doubted that he could make it but the defending titleholder has won his first battle.

Surprisingly, Brook looked every bit as good as the challenger, albeit a touch more drawn, at 146.7 pounds. The Englishman has never lost a fight at the welterweight limit and, if it means anything, appeared to win the staredown. He glared daggers through the challenger, who was very laid back by comparison.

“I’m enjoying myself now,” said Brook in an interview with Sky Sports in the U.K. “I’ve done the hard work, getting down to welterweight. You seen me in great shape here today. I’ve busted my balls; going up to middleweight to fight Golovkin and now I’m back at welterweight, facing the No. 1 challenger for my belt.

“It’s going to be fireworks and I have to be at my best to beat him. I want to make Sheffield proud and I’m going out there to win in style.”

Brook (36-1, 25 KOs) is rated No. 2 by THE RING at welterweight, while Spence, who hails from Desoto, Texas,  is rated No. 7.

In the co-feature, George Groves and Fedor Chudinov will contest the vacant WBA super middleweight title. Chudinov (14-1, 10 KOs) made the weight comfortably at 167.2 pounds. Groves (25-3, 18 KOs) was also inside at 167.6 pounds.

Groves is rated No. 3 by THE RING at super middleweight, while Chudinov is rated No. 8.

Tom Gray is a UK Correspondent/ Editor for RingTV.com and a member of THE RING ratings panel.  Follow him on Twitter: @Tom_Gray_Boxing