• UFC 321(10/25/25) Klein won a three round majority decision over Mateusz Rebecki
• UFC on ESPN(5/31/25) Klein lost a three round unanimous decision to Mateusz Gamrot
• UFC Fight Night(9/28/24) Klein won a three round unanimous decision over Roosevelt Roberts
• UFC on ESPN(6/8/24) Klein won a three round unanimous decision over Thiago Moisés
• UFC Fight Night(3/2/24) Klein stopped AJ Cunningham via strikes at 4:36 of the first round
• UFC on ESPN(8/5/23) Klein won a three round unanimous decision over Ignacio Bahamondes
• UFC 286(3/18/23) Klein fought to a three-round draw with Jai Herbert
• UFC Fight Night(7/23/22) Klein won a three round unanimous decision over Mason Jones
• UFC 272(3/5/22) Klein won a three round split decision over Devonte Smith
• UFC Fight Night(10/16/21) Klein was submitted by Nate Landwehr via anaconda choke at 2:22 of the third round
• UFC on ESPN(5/8/21) Klein lost a three-round unanimous decision to Michael Trizano
• UFC 253(9/26/20) Klein knocked out Shane Young at 1:16 of the first round