A singles ladder is a pairing of tennis members into different ladder boxes. Players compete in singles matches against others in their box.
At the end of each month players with the strongest records move to a stronger box, players with less successful records move to lower boxes.
Ladder boxes usually consist of 5-6 players per box (which likely means 4-5 singles matches per month). Ladder players will have to maintain a minimum of two matches per month in order to stay on the ladder.