Kid would lose in a good 3.5 tournament.
Jim Courier might still be a 6.5 level player now, but as he feeds the kid, he might as well be a 4.0. He's FEEDING, not playing competitively.
Little kid has no match experience, especially against adults. Any strategist would take the kid right off his game, make him crying to mommy in no time.
Obviously, kid as potential to be a top level junior, and even top level player, IN THE FUTURE.
Kids might run like rabbits, but they don't know where to run to, can't cover all that much court (see Karlovic cover court in 2 steps), haven't seen all the wierd shots that tennis can throw at you, and can be thrown off concentration.