The libero replaces back row players without counting as a substitution, so the scoresheet alone cannot show who is on the court. The tracker does. Its job is to answer two questions at any moment: who is the libero standing in for, and would this next replacement be legal? The NFHS rules give the tracker its own duties, including telling the second referee when the libero does not sit out a rally between replacements. Under USA Volleyball the assistant scorer keeps the same record on the libero control sheet.
How to keep it, step by step
- Copy the lineup across the top. Write each team's starters under positions I to VI in serving order, and the libero numbers in their own box, before the first serve.
- Write L when a libero comes on. When a libero replaces a player, write L in the next line under that player's position. The column now shows the libero is in for that player.
- Write the number when the player comes back. When the replaced player returns for the libero, write that player's number under the L. A column reading 10, L, 10 means 10 went off for the libero and came back.
- Write substitutions too. When a substitute enters a position, write the substitute's number in that column, so the tracker always shows who belongs in each position.
- Note the libero's serving position. The first time a libero serves, note the serving position the libero served in. From then on a libero may only serve in that position.
- Watch the timing. A libero who leaves must sit out a completed rally before coming back, unless the libero is replacing the right back player to serve. Tell the second referee at once if that is broken.
Worked example
Computed by Scorerdesk's rule engine under the NFHS profile. Home has one libero, number 1, and middles 12 in position III and 10 in position VI. Rally lines where nothing changes on the tracker are included so you can see the rotation move.
| The feed says | What the scorer does |
|---|---|
| Libero replacement home: 10 out, 1 in. | L in the home libero tracker under VI, entry 1; circle home libero 1 |
| Point home. | mark home running score at 1 |
| Point away. | mark away running score at 1; 1 in the home service box under I, term 1 |
| Point home. | mark home running score at 2; 1 in the away service box under I, term 1 |
| Point away. | mark away running score at 2; 2 in the home service box under II, term 1 |
| Point home. | mark home running score at 3; 2 in the away service box under II, term 1 |
| Libero replacement home: 1 out, 10 in. The libero cannot rotate to the front row. | 10 in the home libero tracker under VI, entry 2 |
| Libero replacement home: 12 out, 1 in. | L in the home libero tracker under III, entry 1 |
| Serve, home, number 1. | III in the home libero serving position |
| Point home. | mark home running score at 4 |
| Point away. | mark away running score at 3; 4 in the home service box under III, term 1 |
| Libero replacement home: 1 out, 15 in. | Flag it (illegal libero replacement). Write nothing for the request. |
| Request denied. Unnecessary delay, administrative yellow card, home. | sanctions row: H, DW, T, 4-3 |
| Libero replacement home: 1 out, 12 in. | 12 in the home libero tracker under III, entry 2 |
| Point away. | mark away running score at 4 |
| Point home. | mark home running score at 5; 4 in the away service box under III, term 1 |
When home wins the serve back for the second time, position VI rotates to the front row, so 10 has to come back on: the tracker gets 10 under VI. Middle 12 is now in right back to serve, and the libero may replace 12 to serve at once, even without sitting out a rally. That is the serving exception, and position III becomes the libero's one serving position. Later, 15 tries to come on for the libero, but only 12 may.
Common mistakes
- Writing the libero's number instead of L, or writing both on one line.
- Missing the forced exit when the libero's position rotates to the front row.
- Letting the libero straight back in the dead ball it left, for a player who is not about to serve.
- Forgetting to note the serving position, so a libero later serves in a second spot unnoticed.
- Leaving substitutions off the tracker, so a column no longer shows who belongs in that position.
- With two liberos, writing an exchange between them. Under the 2026-27 NFHS interpretation nothing is written; see the two libero rule.
Practise it
The free scenario "One libero: replacements, a libero serve and the wrong player back" on the practice page runs this exact job with a feed, and the daily set uses one or two liberos on most days. Certification and training still come from your region or state; this is practice for the table.
Sources
Checked against these sources on 27 September 2026. Rules are paraphrased, never quoted at length, and local procedures differ by region, state and tournament; where yours differ, follow your referees.
- 2026-27 NFHS Volleyball Rules Interpretations, 6 August 2026. situations 1 to 4 on two liberos: one shared serving position, circling each libero's first entry on the scoresheet, and nothing on the tracker for an exchange between liberos.
- NFHS Volleyball Rules Book, 2026-27 edition. rule 5 (scorer and libero tracker duties), 6 (positions and serving order), 7 (lineups), 10 (substitution and libero replacement), 11 (time-outs).
- USA Volleyball Indoor Rules 2025-2027, published August 2025. rules 7 (rotation), 15 (substitutions, time-outs and improper requests), 16 (delays), 19 (the libero), 25 and 26 (scorer and assistant scorer).
- Ohio Valley Region, Juniors Certification Program, 2024-25. an example of a region requiring a certified junior scorer per team and recommending libero tracker training for every player; check your own region's page.