Rafael Nadal beat Daniil Medvedev in the Australian Open final despite trailing 2-0 after the first two sets, thus winning his 21st Grand Slam.
Ash Barty won the match 6-3, 7-6 (7-2) to end a 44-year wait for an Australian to win their home Grand Slam.
Under the lights on Rod Laver Arena, the second seed showed a mix of quality and grit in defeating fourth seed Stefanos Tsitsipas 7-6(5), 4-6, 6-4, 6-1.
Playing under the roof on Rod Laver Arena, Nadal was in complete control for two sets and recovered from losing the third.
Swiatek, who was defeated by the American 6-4 6-1 in 78 minutes, also advanced to the semi-finals of the tune-up event in Adelaide.
Ashleigh Barty defeated Madison Keys while Danielle Collins saw off seventh seed Iga Swiatek for a meeting in the final.
In a free-hitting show on Margaret Court Arena, the Croatian blasted forehands and hammered backhands to end Rublev's time in Australia
After a good start, Jannik Sinner struggled to find his range from the baseline in the second set of the match.
Rafael Nadal had not competed in a tour-level event since August, when he suffered a foot injury in Washington.
The pair's only previous meeting was a five-set first-round battle at the 2019 US Open, which Alexander Zverev won.