Individually counted scoring. Play 1 game, count the number of points each player scored, add points for every game... At the end of each game, points are added, and positions are determined, and courts assigned, based on number of points each individual has. Those with the highest number of points play on Court #1, those with the second highest number of points play on Court #2, etc.
At the end of the night, the rankings will determine which court each player starts on the following week. Every player re-starts at 0 (zero) points every week (so as to not penalize players who don't come every week).