The BBC will broadcast Andy Murray's first ATP final in three years on Saturday.
Karatsev knocked out Murray's compatriot Dan Evans in his semi-final.
It is the first final Murray has reached since the 2019 European Open, where he claimed an emotional victory over Stan Wawrinka.
Scot Murray could claim his 47th ATP title on Saturday, which would be only his second singles title since he had career-saving hip surgery in January 2019.
Murray's final will be live on BBC iPlayer, Red Button, and the BBC Sport website & app from 08:00 GMT on Saturday.