I'm playing in a non-USTA tournament in the 4.0 mens doubles draw (my partner and I both have 4.0C USTA ratings). Our opponents tonight are what I think is a father/son team (same last name), who also happen to be sponsors for the tournament. The father has a current 4.0C USTA rating but the son has an older 5.5 rating from 2000. I was going to play and see...but barring some sort of significant injury, could a previous 5.5 really be at a 4.0 level by just not playing in the last 9 years? I smell something fishy...but who knows. Any suggestions?