UFC on ESPN: Luque vs. dos Anjos

UFC on ESPN: Luque vs. dos Anjos (also known as UFC Vegas 78  and UFC on ESPN 51) was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on August 12, 2023, at the UFC Apex facility in Enterprise, Nevada, part of the Las Vegas Metropolitan Area, United States.

Background
A welterweight bout between former UFC Lightweight Champion Rafael dos Anjos and Vicente Luque was briefly rumored to headline UFC Fight Night: Holm vs. Bueno Silva. However, the pair was moved to this date and served as the headliner.

Chris Daukaus was expected to make his light heavyweight debut against Khalil Rountree Jr. at UFC 289, but withdrew in early June due to injury. The bout was rescheduled for this event.

A bantamweight bout between Gaston Bolaños and Marcus McGhee was scheduled for this event. However, Bolaños withdrew due to undisclosed reasons and was replaced by JP Buys.

Mike Breeden was expected to face Lando Vannata in a lightweight bout at the event. However, Vannata pulled out in early August and was replaced by Terrance McKinney.

Da'Mon Blackshear was expected to face Brady Hiestand in a bantamweight bout at the event. However, Hiestand pulled out in early August due to a medical issue and was replaced by Dana White's Contender Series alum Jose Johnson.

At the weigh-ins, Tafon Nchukwi and Josh Fremd missed weight. Nchukwi weighed in at 189.5 pounds and Fremd weighed in at 189 pounds, three and a half pounds and three pounds over the middleweight non-title fight limit respectively. Both of their bouts proceeded at catchweight and each was fined an undisclosed percentage of their purse, which went to their opponents A.J. Dobson and Jamie Pickett respectively.

Bonus awards
The following fighters received $50,000 bonuses.
 * Fight of the Night: No bonus awarded.
 * Performance of the Night: Khalil Rountree Jr., Iasmin Lucindo, Marcus McGhee, and Da'Mon Blackshear

Aftermath
With seven first-round finishes, this event ties the record for most first-round finishes in a single UFC event.