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On Saturday, Nadal said reaching the final was an important comeback.
The Spaniard is preparing for the Australian Open after winning the Melbourne Summer Set title.
Nadal, who missed the end of the 2021 season with a foot injury, beat American qualifier Maxime Cressy in straight sets.
The Australian Open will be held on 17 January and is being prepared by the 35-year-old.
"It means a lot to be back and with a trophy in my hands," Nadal said.
I am very lucky to be here again. I'm coming back from some injuries, so I'm happy.
It looked as though the first player to take a set from Nadal at the Australian Open would be Cressy.
The American had set point in the opener, but struggled with his serve, and Nadal took advantage to take the first set, before coming from a break down in the second to win the title.
Felix Auger-Aliassime of Canada won the men's singles title at the Australian Open.
Auger-Aliassime won the title with a two hour and 10 minute win over Bautista Agut, after Canada had taken a one nil lead in the final with a win against Pablo Carreno Busta.
In the Australian city of Adelaide, France's Gael Monfils won his first title in over a year.
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