When a team designates 2 liberos, only one libero can be on the court at a time, and they can serve in just one rotation position per set for that team.

Quick Scoop: Basic Rule

  • A team may designate zero, one, or two liberos for a set, depending on the rule set (for example, current USAV rules 2025–2027).
  • Even with two liberos on the roster, only one libero is allowed on the floor at any given time.
  • If the ruleset allows a libero to serve, the libero may serve in only one service rotation position on the scoresheet in that set.

When They Can Serve

  • Either of the two liberos may be chosen to be the serving libero, but whichever libero serves must always serve in the same rotation position for that entire set (for example, always when position 1 comes to serve).
  • The specific rotation position in which the libero serves can change from set to set , but not within the same set.

Using Two Liberos Together

  • A team with two liberos may freely exchange them between rallies, as long as all normal libero replacement rules are followed and there is a completed rally between replacements (except where the rules explicitly allow a special serving replacement).
  • Either libero may serve in that one allowed rotation, but still only one libero may serve for the team in that set and they must not end up serving from more than one rotation position, or it becomes a rotation fault.

Practical Example

  • Example: Libero #3 plays back row defense for the middle and is also designated to serve in rotation 1; later in the match, after a rally, the coach decides to use Libero #14 instead. Libero #3 and the regular player exchange, Libero #14 takes the court and then serves in that same rotation 1 spot ; this is legal because the team still has only one serving position for its liberos in that set.
  • If a second libero attempts to serve in a different rotation in the same set (for example, rotation 4 after the first libero already served in rotation 1), this is a rotational fault and the referee should award the rally to the opponent.

Mini TL;DR

  • Two liberos allowed on the lineup in many current rule codes.
  • Only one libero on court at a time.
  • Libero serving is limited to one rotation spot per set for the team, even if there are two liberos.

Information gathered from public forums or data available on the internet and portrayed here.