I have lost to 2 different 3.5 LEAGUE players, who both play 4.0 tourneys. Always close, but I lose because I have not been able to run for 6 years. One of them is undefeated this season, maybe 5 league matches, the other lost once. They both seem to be proud of saying they are "3.5", and dont' seem to have mentioned they play in 4.0's also. So, losing to them, I'm sure I can beat any legit 3.5 pretty easily. I can still play 4.5 doubles, can step in and compete in 5.0 doubles. Lefty helps, as does confidence in a good volley and serve.