Medvedev will now play in his third Australian Open final, having lost the previous two - first against Novak Djokovic, then against Rafael Nadal.
He said he had been working hard to improve his mental resilience in particular.
“Mentally and physically it’s tough, five sets. Many times in the fifth set I was not strong enough,” he said.
“One month ago, I wanted to change a little bit even more to be even stronger mentally, to think less about one guy in the crowd who screams something at you, or when I think the referee has done something wrong.
“I try to focus more - I’m far from being perfect, but I’m trying.”
Asked what a win on Sunday would mean, said Rod Laver Arena was not his “best court, in terms of my performance and my actual self-esteem”.
“That’s why many times I had to dig deep during these tournaments. So I would be the happiest man on the planet, but for this I need to play pretty well and win three sets on Sunday.”