Errol Spence Jr. vs. Terence Crawford, billed as Undefeated. Undisputed. Unprecedented., was a welterweight professional boxing match between unified WBA Super, WBC and IBF champion, Errol Spence Jr., and WBO champion, Terence Crawford. The fight took place on July 29, 2023 at the T-Mobile Arena in Paradise, Nevada.

Crawford defeated Spence via ninth-round technical knockout to become the first male to win the undisputed championship in two weight classes in the four belt era.^[3] The fight reportedly sold 700,000 PPV buys, generating over $59 million in revenue. It also generated over $20 million from ticket sales.^[4][5]

In November 2018, American professional boxers Errol Spence Jr. and Terence Crawford came face to face at the Chesapeake Energy Arena in Oklahoma City. They exchanged words, expressing their desire to face each other.^[6] In April 2019, Crawford defeated English boxer Amir Khan via technical knockout and called out Spence to a bout.^[7] In November 2020, Crawford defeated Kell Brook, the first common opponent between Spence and Crawford, via technical knockout. Crawford called out Spence once again.^[8] In April 2022, Spence returned from a career-threatening surgery after he was involved in a single-vehicle accident in October 2019.^[9] He defeated Cuban boxer Yordenis Ugás via technical knockout and proceeded to call out Crawford.^[10]

In September 2022, Spence and Crawford were on the verge of a deal after months of negotiations for November 19.^[11] However, negotiations collapsed at the 11th hour.^[12] On October 20, Crawford told ESPN;

"I agreed to all of their [B.S.] and they've been dragging their ass for months. Spence was nowhere to be found while I was trying to make the deal. I explained to Al Haymon and Errol that I was going to fight before the end of the year. ... David Avanesyan is a very tough task. He's knocked out his last six opponents and this guy is dangerous. Once I'm successful against Avanesyan, my plan is still the same: whup Errol Spence's ass."^[13]

That same day, Spence replied on Twitter stating;

"[He's] been stalling for months I could’ve fought in November... been fighting at this weight for over a decade this shit ain’t easy or fun."^{[‡ 1][‡ 2]}

In December, Crawford defeated Russian boxer Avanesyan via knockout.^[14] In March 2023, Spence and Crawford revealed that they had a roughly 30-minute phone call in February with getting the deal over the line after Spence appeared headed for a fight with American boxer Keith Thurman at 154 pounds.^[15]

On May 23, ESPN reported that Spence vs Crawford agreed to a July 29 deal fight for the undisputed welterweight championship in Las Vegas.^[16] On May 25, it was announced that Spence and Crawford would face each other on July 29 at the T-Mobile Arena in Paradise, Nevada for the WBA Super, WBC, IBF and WBO welterweight titles.^[17]

^Note 1 For WBA (Super), WBC, IBF, WBO, and vacant The Ring welterweight titles
^Note 2 For WBC Silver and vacant WBO Latino lightweight title
^Note 3 For vacant WBC bantamweight title