I think it depends on the kid too. Tennis is much more difficult for my older son. When he was younger he would automatically think he was going to lose if he knew he was playing a seed. My younger son is always seeded at his age level and now is getting seeded is many tournaments in the next age level. He looks at the draw sheet at the tournament, asks me who he is playing and on and on. For him it does not make much difference.
Wilson 6.1 95