The Legends event February 7-9th kicks off the Delray Beach Open ATP tournament that runs through February 16th.
The American will make his second appearance at the ATP's year-end championships.
The Italian announced the news early on Tuesday.
"If I say I went there just for fun or to play and forget the money, I'm gonna lie," Carlos Alcaraz said of playing Six Kings Slam.
Arthur Fils asserts his friend and sometime doubles partner Giovanni Mpetshi Perricard will be among the elite.
The Race to Turin will heat up in Paris, as four spots are currently unclaimed for this year's ATP Finals.
Thanks to his win on Friday, the Frenchman added $615,000 to his net worth.