I-Formation (Doubles)

In the I-formation, the net player crouches low directly on (or very near) the center service line. The player visually splits the court down the middle rather than standing clearly on one side, as in standard doubles positioning. The server and net player agree beforehand which direction the net player will move immediately after the serve. The crouching position hides that decision from the returner until the last possible moment. This disrupts the returner's ability to pre-plan a return direction based on where the net player is standing.

The I-formation is used most often against a strong returner who has been picking apart standard positioning by aiming returns at the open gaps. It is also used to set up an aggressive planned poach on a big first serve. Communication is critical. The net player's crouching position blocks the server's view of part of the box. So the server needs to trust the prearranged plan rather than adjusting mid-motion. The net player must move decisively right after the serve is struck, rather than waiting to read the return.