One line of players behind the baseline, another line of players on the opposite side, baseline also.
A coach (or a feeder) is at the net with a basket of balls; he feeds always to the side with one player on the court (once the game begins).
First player in one line will play against the first player from the other line. Whoever wins stays and brings another player on the court (the next in line). Whoever loses, moves out to the end of the line and the next player in line steps up to play.
As long as the players keep winning, they keep bringing a new player on the court. Once they lose, they all go to the end of the line (wipe out).
The game continues until there is a team with all its players on the court playing against the other team’s remaining player.

Note: this is a fun game for groups of 6 and more players.