Early career

He started with MMA in 2009 in Valetudo club in Hradec Králové. He had his first professional fight at the age of 18 in 2010, when he lost on points to Filip Mack. Dvořák would then compile a 17–3 record fighting across various Czech regional promotions. Now he trains in clubs TopAtlet and All Sports Academy. His main coaches are Patrik Kincl, Jan Maršálek and Lukáš Chotěnovský. Apart from domestic clubs, he has also gained experience abroad. He has attended training camps in London, Poland,^[7] and Thailand, where he spent six months training with clubs such as Team Quest, Phuket Top Team and Tiger Muay Thai.^[8]

XFN

Dvořák made his debut with the Czech-based XFN at XFN 5 on October 21, 2017, when he was booked to face Miroslav Kubáň. He won the fight by a second-round technical knockout.^[9]

Dvořák made three more appearances with XFN. Dvořák first faced Marco Manovali at XFN 8 on March 3, 2018. He won the fight by a first-round technical knockout. Dvořák next faced Salambek Damaev at XFN 13 on November 10, 2018. He won the fight by a second-round submission.^[10] Dvořák faced Zaka Fatullazade at XFN 15 on December 27, 2018, in his fourth and final appearance with the promotion. He won the fight by a first-round technical knockout.^[11]

Dvořák faced Arsen Taigibov at Oktagon 13 on July 27, 2019. He won the fight by a second-round submission.^[12]

Ultimate Fighting Championship

He signed a contract with the UFC in 2020, becoming the fourth Czech to achieve such a feat. He accepted the offer with only five weeks' notice before the UFC Fight Night: Lee vs. Oliveira event in Brazil on March 14, 2020, where he replaced fighter Su Mudaerji. In his debut bout, he faced Bruno Gustavo da Silva, whom he defeated on points after three rounds.^[13]

At the UFC Fight Night: Covington vs. Woodley event held in Las Vegas on September 19, 2020, he faced Jordan Espinosa, who was ranked 13th in the flyweight rankings before the fight. Dvořák defeated his better-ranked opponent on points by unanimous decision, extending his unbeaten streak to 15 fights.^[14]

Dvořák was scheduled to face Raulian Paiva on May 22, 2021, at the UFC Fight Night: Font vs. Garbrandt event.^[15] However, Paiva pulled out of the fight the day before the event due to ill effects related to his weight cut. He was replaced by promotional newcomer Juancamilo Ronderos.^[16] At the weigh-ins, Ronderos weighed in at 128.5 pounds, two and a half pounds over the division's non-title fight limit. The bout proceeded at catchweight and he was fined 20% of his purse, which went to Dvořák.^[17] Dvořák won the fight via a rear-naked choke submission in the first round.^[18]

Dvořák faced Matheus Nicolau on March 26, 2022, at UFC on ESPN 33.^[19] He lost the fight by unanimous decision.^[20]

Dvořák faced Manel Kape on December 17, 2022, at UFC Fight Night 216.^[21] He lost the fight via unanimous decision.^[22]

Dvořák was scheduled to face Matt Schnell on June 10, 2023, at UFC 289.^[23] However, Schnell pulled out in late May due to injury and was replaced by promotional newcomer Steve Erceg.^[24] In an upset, he lost the bout via unanimous decision.^[25]

Dvořák was scheduled to face Tatsuro Taira on October 14, 2023, at UFC Fight Night 230.^[26] However, the bout was cancelled for unknown reasons.^[27]