The 45-year-old Shaq made the claim on his own podcast, drawing a fairly bemused reaction.
As the Washington Post pointed out, his research involved “driving cross-country a few times”.
Satirist Bill Maher tried to help O’Neal out, reminding him the earth was shaped like a basketball.
Meanwhile, entertainment site A.V Club reckoned: “The belief that the Earth is not round like a basketball, but flat like the paint, is spreading like a bad case of athlete’s foot through the basketball community.”
USA Today said: “Obviously, the basis of driving from Florida to California would not be nearly scientific enough to justify the flat-Earth claim, but that was all Shaq needed to see and he’s standing by it.