on September 22, 2018, at UFC Fight Night 137. However, on September 14, 2018 Muhammad was pulled from the bout and he was replace by newcomer Luigi Vendramini. He won the fight via knockout in round two. Zaleski was scheduled to face Li Jingliang on November 25, 2018, at UFC Fight Night 141. However on October 27, 2018, it was reported that Zaleski withdrew from the bout due to a partial ligament tear in his right knee. Zaleski faced Curtis Millender on March 9, 2019, at UFC Fight Night 146. He won the fight via submission in the first round. Zaleski was expected to face Neil Magny on May 18, 2019, at UFC Fight Night 151. However, on March 28, 2019 dos Santos announced that he had not been contacted by the UFC about the match. A pairing with Li Jingliang was rescheduled and took place on August 31, 2019, at UFC Fight Night 157. He lost the fight via technical knockout in round three. As the last fight of his prevailing contract, Zaleski faced Alexey Kunchenko on March 14, 2020 at UFC Fight Night 170. He won the fight via unanimous decision. As the first fight of his new, four-fight contract, Zaleski faced Muslim Salikhov on July 11, 2020 at UFC 251. He lost the fight via a split decision. Zaleski was expected to face promotional newcomer Shavkat Rakhmonov on October 24, 2020 at UFC 254. However, Zaleski pulled out in late September due to a knee injury that required surgery. Zaleski faced promotional newcomer Benoît Saint-Denis on October 30, 2021 at UFC 267. After nearly finishing Saint Denis in round two, he won the bout via unanimous decision. Zaleski was scheduled to face Mounir Lazzez on April 16, 2022 at UFC on ESPN 34. However, Zaleski dos Santos withdrew the week of the fight due to personal reasons and was replaced by Ange Loosa. On September 22, 2022, it was announced that USADA suspended Zaleski for 1 year after testing positive for ostarine in an out-of-competition test on March 14, 2022. Zaleski and his team contended that the test was due to a contaminated supplement. He is eligible to return on March 14, 2023. Championships and accomplishments Mixed martial arts Ultimate Fighting Championship Fight of the Night (Three times) vs. Omari Akhmedov, Lyman Good and Max Griffin Jungle Fight Jungle Fight Welterweight Championship (One time) One successful title