UFC on ESPN: dos Anjos vs. Edwards (also known as UFC on ESPN 4) was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on July 20, 2019, at the AT&T Center in San Antonio, Texas.
The event marked the promotion's second visit to San Antonio and first since in June 2014.
A welterweight bout between former UFC Lightweight Champion Rafael dos Anjos and Leon Edwards was the event headliner.
Alexey Oleynik was expected to face Walt Harris on May 4, 2019, at . However, Oleinik was pulled from the pairing with Harris on April 3 and instead faced Alistair Overeem at after former Bellator Heavyweight Champion Alexander Volkov had to withdraw. The pairing was rescheduled for this event.
A lightweight bout between Alexander Hernandez and Francisco Trinaldo has also been rescheduled for the event. The pairing was first expected to take place on January 26, 2019, at UFC 233. However, Hernandez was pulled from that fight in favor of a bout with former lightweight title challenger Donald Cerrone a week earlier at .
A women's flyweight bout between former UFC Women's Bantamweight Championship challenger Liz Carmouche and former UFC Women's Flyweight Championship challenger Roxanne Modafferi was scheduled for the event. However, Carmouche was pulled from that bout in favor of a rematch with current champion Valentina Shevchenko in August at . Modafferi is now expected to face former Invicta FC Flyweight Champion Jennifer Maia in a rematch of their 2016 bout, which Maia won via split decision to defend the title. At the weigh-ins, Maia weighed in at 129 pounds, 3 pounds over the women's flyweight non-title fight limit of 126. As a result, Maia was fined 30 percent of her purse, and the bout proceeded as scheduled at a catchweight.
The following fighters received $50,000 bonuses.
With a total of ten (10) decisions on the card, the event tied UFC 169, , , , and later and for the most decisions at a single UFC event. The record was later broken by UFC 263 in 2021, which had eleven decision bouts.
Nine consecutive decisions was also a new UFC single-event record.