Team Sandbag

An unfairly stacked team of players. Usually due to individuals on the team claiming to be less skilled than they really are during team formation stages of a tournament.

Organizer - "Hey Joe, what level of paddle tennis player are you? Beginner, Medium, or Advanced? We are trying to have balanced teams for the tournament"
Joe - "I am probably a Medium skilled player"
Organizer - "Great, You will be paired with Mark, who is an advanced player"
.... after Joe and Mark win tournament
Organizer - "Joe, you didn't say that you have played organized tennis in high school... you should have been in the advanced tier of players. However, Team Sandbag wins!"