Round 11: Brook's left eye is in bad shape and he takes a knee without being hit and fight is over!!! Spence by TKO11 and wins a welterweight title. He really closed the show!

Round 10 and Brook is driven to the canvas!! Spence all over him and has a huge round! Brook in big trouble. 10-8 for Spence.

Round 9 and Brook's left eye is swelling. Been eating Spence jabs. Spence has a big round! 5-4 Brook.

Round 8 and it's a rough fight! Both guys landing good shots. Spence had better of that round early and Brook late. Brook lands solid right upstairs late. Brook round. 5-3 Brook.

Round 7 slows down a bit. Both taking a breather? Brook edges it. 4-3 Brook.

Round 6 Brook knocked Spence off balance with a right hand early on. Spence comes back and has excellent round. Spence 10-9. I have it 3-3.

Round 5 was a close one. I thought Brook landed some very good inside shots. Round to Spence. Brook up 3-2.

Round 4 more good action. Been a good fight Brook edges that round. 10-9.

Round 3 Brook may have hurt Spence with a right hand. Good round for Brook. 2-1 Brook.

Action heats up in round 2. Good close round. I gave it to Brook 10-9.

Rd 1 is a battle of jabs and Spence going after the body. Spence's round.

A few things to know ahead of the Kell Brook title defense against Errol Spence Jr. tonight: •Brook: 36-1 (25 KO); making fourth defense of IBF welterweight title •Brook: Suffered first career loss to Gennady Golovkin in last fight (fought at middleweight) •Brook: No. 3-ranked welterweight according to ESPN • Spence Jr.: 21-0 (18 KO); 8-fight knockout streak •Spence Jr.: Seeking to become second fighter from the 2012 U.S. Olympic Boxing Team to win a world title (Rau'Shee Warren) •Spence Jr.: No. 6-ranked welterweight according to ESPN

George Groves won a vacant super middleweight title by stopping favorite Fedor Chudinov in the sixth round of their fight at Sheffield Stadium in England on Saturday. After the victory, when asked who who would like to face next, Groves said, "who wants to fight me? I'm tired of chasing opponents."

Bramall Lane in Sheffield is filling up ahead of the IBF world welterweight title fight between Briton Kell Brook and American Errol Spence, due to start 10.30pm local time. Typical British weather has seen light rain shortly followed by sunshine at the outdoor venue.

Former two-division world titleholder Orlando Salido, who likely will challenge junior lightweight titlist Vasyl Lomachenko this summer in a rematch of Salido's close 2014 decision win, first has to get through a tune-up fight on Saturday night (11 ET, beIN Sports Espanol) in his hometown of Ciudad Obregon, Mexico. But instead of Salido (43-13-4, 30 KOs), who is coming off an 11-month layoff, facing Thailand's Amphon Suriyo (18-2, 14 KOs) asplanned he will instead face last-minute replacement Aristedas Perez (30-9-2, 16 KOs), of Colombia, in the scheduled 10-rounder. Suriyo was dropped from the fight because of issues with his visa, Sean Gibbons, Salido's manager, told ESPN.

Top Rank chairman Bob Arum told ESPN on Wednesday that if featherweight prospect Michael Conlan, the Irish Olympic star, wins his second pro fight on Friday night he will next fight July 2 on the Manny Pacquiao-Jeff Horn card in Brisbane, Australia, where there are thousands of Irish, including several of Conlan's family members who moved there seven years ago. Also on the card, Arum said junior bantamweight world titlist Jerwin Ancajas (26-1-1, 17 KOs), of the Philippines, will make his mandatory defense against Japan's Teiru Kinoshita (25-1-1, 8 KOs), who challenged Zolani Tete for the same belt in 2014 and lost a unanimous decision.

HBO and Showtime both had world title cards Saturday night that, for a change, didn't conflict. HBO, with the later start time of 10:15 p.m. ET/PT, averaged 961,000 viewers for the live airing of junior welterweight champion Terence Crawford's dominant win against Felix Diaz, according to Nielsen Media Research. That's the biggest viewership for any premium cable fight so far this year. It peaked at 1.036 million viewers. The average viewership was a 19 percent increase from Crawford's last HBO fight in December when his domination of John Molina Jr. averaged 806,000 viewers. The Ray Beltran-Jonathan Maicelo lightweight eliminator in the co-feature averaged 687,000 viewers (723,000 peak). On Showtime, which began at 6 p.m. ET, the Gary Russell-Oscar Escandon featherweight title fight main event averaged 481,000 viewers (517,000 peak). The Andre Dirrell-Jose Uzcategui interim super middleweight title bout co-feature averaged 354,000 viewers (459,000 peak). The Rances Barthelemy-Kiryl Relikh junior welterweight title eliminator averaged 267,000 viewers (295,000 peak). The opener, a brief tape delay of junior lightweight titlist Gervonta Davis' defense against Liam Walsh from London, averaged 228,000 viewers (253,000 peak).

It should come as no surprise but on Tuesday the Shannon Briggs-Fres Oquendo fight for a vacant secondary heavyweight world title was officially cancelled, as was the entire card. The show was scheduled to take place on June 3 at the Hard Rock Live at the Seminole Hard Rock Hotel & Casino in Hollywood, Florida, but canceled because Briggs tested positive for dramatically increased levels of testosterone in a random urine test conducted by the Voluntary Anti-Doping Association on May 14. Briggs' test result was ruled "atypical" when his testosterone to epitestosterone ratio was 7.89 to 1, which far exceeded the allowable threshold of 4 to 1 under World Anti-Doping Agency standards.

Super middleweight contender Jose Uzcategui was transferred to the MedSTAR trauma center in Washington D.C. for further evaluation after he was sucker punched by Andre Dirrell's uncle and co-trainer Leon Lawson Jr. after his DQ loss to Dirrell on Saturday. Photo provided by Sean Gibbons.