Tsitsipas replied after Rafael Nadal tweeted asking if he can win it this year; joking that Roger Federer will win it for the 68th time in a row.
In terms of previous winners, Nadal has only won it twice in 2010 and 2018; while Federer has won it in every other year barring 2004.
In addition, both players are nominated alongside Diego Schwartzman and Dominic Thiem; also the awards will be revealed towards the end of the year. Finally, Tsitsipas himself is nominated for the Most Improved Player of the Year.
https://twitter.com/StefTsitsipas/status/1199773823266164736?s=20