The fights at UFC Apex will be on ESPN+, with the main card starting at 4 p.m. ET and prelims at 1 p.m.
Gane (8-0), who is No. 4 in the ESPN heavyweight rankings, is coming off a February victory over ranked fighter Jairzinho Rozenstruik, just the second bout of Gane's career to go the distance.
The sixth-ranked Volkov (33-8) has won two in a row, most recently a second-round knockout of Alistair Overeem in February.
How to watch the fights
Don't have ESPN+? Get it here.
There's also FightCenter, which offers live updates for every UFC card.
Saturday's fight card
ESPN+, 4 p.m. ET
Ciryl Gane vs. Alexander Volkov | Heavyweight
Tanner Boser vs. Ovince Saint Preux | Heavyweight
Kennedy Nzechukwu vs. Danilo Marques | Light heavyweight
Andre Fili vs. Daniel Pineda | Men's featherweight
Tim Means vs. Nicolas Dalby | Welterweight
Renato Moicano vs. Jai Herbert | Lightweight
ESPN+, 1 p.m. ET
Raoni Barcelos vs. Timur Valiev | Men's bantamweight
Shavkat Rakhmonov vs. Michel Prazeres | Welterweight
Warlley Alves vs. Jeremiah Wells | Welterweight
Marcin Prachnio vs. Ike Villanueva | Light heavyweight
Julia Avila vs. Julija Stoliarenko | Women's bantamweight
Charles Rosa vs. Justin Jaynes | Men's featherweight
Yancy Medeiros vs. Damir Hadzovic | Lightweight