A relentless Russia crushed Italy 2-0 to win their maiden ATP Cup Sunday with Daniil Medvedev and Andrey Rublev in ruthless, red-hot form leading into the Australian Open.

Russia were the only nation in the 12-team event to boast two top 10 players and they had swept past Japan, Argentina and Germany en route to the decider.

Italy were flattened by the same Russian juggernaut on Rod Laver Arena, with Rublev destroying Fabio Fognini 6-1, 6-2 in just 61 minutes before Medvedev overpowered Matteo Berrettini 6-4, 6-2 in 79 minutes.

Daniil Medvedev steered Russia to the ATP Cup title
Daniil Medvedev steered Russia to the ATP Cup title AFP / William WEST

"It's unbelievable," said Russia captain Evgeny Donskoy.

"If the level is going to be the same, these guys are going to see each other in the (Australian Open) quarter-finals because I saw the draw."

World number four Medvedev and eighth-ranked Rublev have been the two hottest players on tour since last year's US Open.

Russia celebrate winning the ATP Cup after beating Italy on Sunday
Russia celebrate winning the ATP Cup after beating Italy on Sunday AFP / William WEST

They kick off their Australian Open campaigns on Tuesday and are scheduled to meet in the last eight.

Medvedev is now on a career-long win streak of 14 matches, including his third ATP Masters title in Paris and victory at the season-ending ATP Tour Finals, with 10 of those victories over top 10 opponents.

"It's a really big achievement ... it's a big boost in confidence," said Medvedev of his run of wins against top-ranked players.

Russia's Andrey Rublev is in red-hot form
Russia's Andrey Rublev is in red-hot form AFP / David Gray

"Even when you lose, you know that you're capable of playing this level, and it helps you for the next time to stand up."

Rublev has been equally impressive, winning five ATP titles in a breakthrough 2020, more than anyone else, as he raced up the rankings.

He ended his season by beating world number three Dominic Thiem at the ATP Finals and has started 2021 with four straight wins at the ATP Cup, dropping just one set, to make him a contender at the Australian Open.

Russia's Daniil Medvedev (left) and Andrey Rublev lift the ATP Cup after beating Italy in the final
Russia's Daniil Medvedev (left) and Andrey Rublev lift the ATP Cup after beating Italy in the final AFP / William WEST

His sizzling form extended to world number 17 Fognini, who went into the match with a 5-1 record against the Russian but was blown away.

Rublev dominated with his forehand and lost just seven service points in the entire match.

"I was playing really well all week since the first match and I was just going on court thinking that I needed to fight for every ball," said Rublev.

"I knew it didn't matter the score, he always has a chance. He always knows how to come back, so I was trying to keep going no matter the score."

Medvedev faced a tougher assignment against Berrettini, the world number 10 who has also been in prime early season form, winning all his matches before meeting the Russian, including against world number three Dominic Thiem.

The 24-year-olds had only met once before, in 2018, when Medvedev won, and he took an early break in the opening set to go 3-1 ahead, holding on to serve out the set.

It followed a similar pattern in the second set with the machine-like Medvedev raising his game to another level to grind down Berrettini.

"He's playing really good. He's confident, you can tell. He's a really tough player to beat," said Berrettini of Medvedev. "These days, you just have to say bravo to him and think about the next matches."

Serbia beat Spain in the final of the inaugural and hugely popular tournament last year in Sydney -- launched as a rival to the Davis Cup.

It has been slimmed down from 24 teams to 12 this year due to the coronavirus over five days at Melbourne Park with $7.5 million at stake, rather than the multi-city format employed in 2020.