Cheyanne Buys will step in for Montserrat Ruiz and face Mallory Martin at UFC on ESPN 31 on Dec. 4.
MMAFighting.com was first to report the new strawweight booking. A reason for Ruiz’s withdrawal is currently unknown. UFC on ESPN 31 takes place at the UFC Apex in Las Vegas and is headlined by a bantamweight showdown between Jose Aldo and Rob Font.
After dropping a unanimous verdict to Ruiz in her Octagon debut, Buys secured her first promotional triumph at UFC on ESPN 28, when she stopped Gloria de Paula in 60 seconds on July 31.