The controversial Kyrgios, who turns 22 on Thursday, has been impressive since a spectacular meltdown in the Australian Open second round in January.
The world number 16 pushed eventual champion Roger Federer to the brink in the semi-finals in Miami this month and has made the semis in three of his last four tournaments.
The Australian also overpowered Novak Djokovic two times in as many weeks in March to become the first player in eight years to beat the world number two in back-to-back hard court tournaments.
"You've always got to be wary of some dangerous floaters at the French Open because there's so many good claycourters, especially from Europe.
"So in some of those early rounds, he's got to be wary and pay that respect to those opponents, but he could easily get through to the fourth round and then the draw opens up and all of a sudden you're deep into the second week."
"And for a big guy -- six foot four -- he moves bloody well. So it's not his best surface... But I'm very comfortable with him on that surface."
Kyrgios crashed out of last year's French Open in the third round against Richard Gasquet and was fined for an audible obscenity during the loss. He also received a code violation at the Grand Slam for shouting at a ball boy.
"He's the kind of guy that needs a little bit of space as well," Hewitt added.
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