Daniil Medvedev put the Russian Tennis Federation into the Davis Cup final with a dominant win over Germany's Jan-Lennard Struff in Madrid.

World number five Rublev needed just 49 minutes to win 6-4 6-0 in the opener.

US Open champion Medvedev also looked assured to spark Russian celebrations and tee up Sunday's final with Croatia.

Croatia booked their spot in the showpiece tie, which takes place in Madrid at 15:00 GMT, with a 2-1 victory over Serbia in Friday's first semi-final.

The Russians, playing under the name of their federation because the nation is banned from international competition for doping violations, were the pre-tournament favourites and have demonstrated why with some strong performances.

Medvedev, 25, had won all three of his previous matches without dropping a set and he was never under pressure in this match either.

After an even start where Struff had looked comfortable on serve, a sloppy game from the German helped Medvedev to break for 5-4 and he wrapped up the opening set with another strong hold.

From that point, it looked unlikely that the Russians would need a deciding doubles match to seal victory.

Even needing treatment for a nosebleed, shortly after breaking for 3-2 in the second set, and facing a break point as he served for the match, did not disrupt Medvedev's progress as the Russians reached their sixth Davis Cup final.

They now have a chance to win the event for the first time since 2006.

Doubts had been raised about Rublev's level after mixed fortunes at the Finals, but he responded with an imperious display against Koepfer in the opening rubber.

An early break in the first set allowed the world number five to settle and he remained focused throughout a dominant win.

"I think the main difference was from the beginning to the end I was super focused and tried to raise my level game by game," he said.