1) LeBron
2) Durant
3) Carmelo
4) Harden
5) Kyrie
6) Derozan
7) George

IT
9) Lillard
10) Curry
Probably in that order.
Honorable mentions to Butler, Kemba Walker, and CJ McCollum.
I count Towns and Cousins in the top 10 if we're talking most unstoppable 1-on-1, but they need someone to get them the ball first (ie they can't necessarily dribble the clock out at the top of the key for 20 seconds).