9-ball is a fast rotation game for two players and nine balls. The cue ball has to hit the lowest-numbered ball on the table first on every shot except a push-out, and whoever legally pockets the 9-ball wins the rack.
I’ve played more 9-ball than any other format, and what hooks people is the combo potential. You can win by sinking the 9-ball on any legal shot, as long as the cue ball contacts the lowest ball first. One good combo and the rack is over, and almost every shot carries that chance.
The fine print changes with the rulebook. This guide follows the current WPA Rules of Play (effective September 15, 2025) and flags where APA and CSI league rules part ways with it, starting with where the rack sits.
How 9-Ball Differs from 8-Ball
The biggest difference is ownership: in 9-ball nobody has a group of balls. In 8-ball, each player owns a group of balls (solids or stripes) and must clear their group before shooting the 8. In 9-ball, both players shoot at the same 9 balls in numerical order, and the only ball that matters is the 9.
The other big difference is shot calling. You don’t need to call your shots in 9-ball under WPA, CSI or APA rules. If the cue ball hits the lowest ball first and the 9 accidentally rolls into a pocket, you win. That’s the sharpest contrast with 10-ball, which makes you call every shot and spots a 10 that drops by accident.
How to Rack for 9-Ball
Nine balls go into a diamond-shaped rack, with the 1-ball at the front and the 9-ball in the center. Where the diamond sits depends on whose rules you play.
Under the current WPA rulebook, the 9-ball sits on the foot spot and the 1-ball points toward the breaker at the front of the diamond. APA and CSI leagues still put the 1-ball on the foot spot, which sits the whole rack a little farther from the breaker. Rack it the WPA way in WPA events, and follow your league’s rule on league night.
Every other ball fills in randomly. No major rulebook fixes the 2-ball or any other ball. WPA Regulation 15 goes further and bans setting the rest in a deliberate order: a player caught doing it gets a warning, then a penalty for unsportsmanlike conduct.
If you don’t have a diamond rack, you can use a standard triangle rack. Build the diamond inside the triangle with the 1-ball at the apex and the 9 in the center, then line it up on the spot your rules call for. Press the balls tight against each other and lift the rack straight up so the formation holds.
Rack it tight. Gaps between the balls soak up energy on the break, and the spread suffers. When a break dies, check the rack before you blame your arm, and see our racking guide for the technique plus who racks under each league’s rules.
The Break
The cue ball starts in the kitchen, the area behind the head string (the imaginary line across the table at the second diamonds). The breaker must hit the 1-ball first. For the break to be legal, either a ball must be pocketed or at least four object balls must reach a rail.
If neither happens, it’s a foul under WPA and CSI rules, and the incoming player takes ball in hand anywhere on the table. APA rules handle it differently. The balls get re-racked and the same player breaks again, unless the failed break was also a scratch, in which case the opponent breaks. APA rules also require a hard break, so soft or safe breaks aren’t allowed.
WPA rules stack a three-ball rule on top (rule 5.3 and Regulation 16). At least three object balls have to be pocketed or end up past the head string, counting both together.
If the breaker falls short on an otherwise legal break, the incoming player can take the table as it lies (with no push-out) or hand the shot back. If they hand it back, the breaker may push out. WPA requires the three-ball rule at its ranking 9-ball events, while CSI and APA rules don’t use it.
Winning the game on the break is legal under all three rulebooks. If you hit the 1-ball first and the 9-ball drops on a legal break, the rack is over and you win. Scratch on that break and the 9 gets spotted while your opponent takes ball in hand. Under WPA rules, a 9 made on a break that fails the three-ball rule gets spotted too.
It’s rare, but it happens often enough that every breaker is thinking about it. A controlled, solid break is what sets up those wins. A lot of 9-ball regulars keep a dedicated break cue for that shot and save their playing cue for the rest of the rack.
Gameplay and Legal Shots
After the break, players take turns. On every shot except a push-out, the cue ball must contact the lowest-numbered ball on the table first.
After that initial contact, any ball that goes in a pocket stays down. You keep shooting as long as you pocket a ball legally. Miss or foul, and your opponent takes over.
Combinations on the 9 win racks. If the 3-ball is the lowest on the table and you hit it into the 7-ball, which then knocks the 9-ball into a pocket, you win the rack. As long as the cue ball touched the 3 first, everything after that is fair game. I’ve played hundreds of racks that ended on an unexpected combo that neither player saw coming.
You can also use kick shots (banking the cue ball off a rail to reach the lowest ball), or jump over a blocker with a jump cue, if your cue ball is blocked. As long as you make legal contact with the lowest ball first, the shot counts.
Fouls
A foul gives your opponent ball in hand, meaning they can place the cue ball anywhere on the table before their next shot. That’s the penalty under WPA, CSI and APA rules alike, and it often leads to a run-out.
The common fouls in 9-ball:
- Cue ball goes in a pocket (scratch) or off the table
- Cue ball contacts any ball other than the lowest-numbered ball first
- No ball reaches a rail after the cue ball contacts the lowest ball (and no ball is pocketed)
- Cue tip hits the cue ball twice on one stroke (double hit)
- Player touches a ball with a hand, cue or clothing (WPA rules count any ball; CSI and APA rules usually let an accidentally bumped object ball be put back)
- Player shoots before every ball has stopped moving
If the 9 goes in on a foul, it gets spotted on the foot spot and your opponent still takes ball in hand.
Knocking an object ball off the table is a foul under WPA and CSI rules, and that ball stays out of play. The one exception is the 9 itself, which gets spotted on the foot spot so the rack can still be won. APA rules spot every jumped ball on the foot spot instead.
Three consecutive fouls is an automatic loss of that rack under WPA and CSI rules. You have to be warned that you’re on two fouls before the rule applies, and without the warning the third foul counts as only the second. The APA has no three-foul rule.
The Push-Out
The push-out lets the player shooting right after a foul-free break move the cue ball anywhere without the usual contact rules. On that shot (and only that shot), the shooter calls “push” and hits the cue ball to any position on the table. The push doesn’t have to contact the lowest ball or send anything to a rail.
The opponent then decides whether to shoot from the new position or hand it back. Any ball pocketed on a push-out stays down, except the 9, which gets spotted.
The push-out exists because the break often leaves the cue ball in an awkward spot. A good push moves the cue ball to a shot you’d happily take but your opponent probably won’t. If they shoot it and miss, you’re in. If they hand it back, you shoot a shot you picked.
Your league may not use it. APA rules don’t allow push-outs in handicapped play, though APA Masters divisions, which follow U.S. Amateur Championship rules, do. CSI rules allow it, and your opponent has to acknowledge the push before you shoot.
WPA vs APA vs CSI 9-Ball Rules
The three rulebooks most U.S. players run into agree on the basics of 9-ball. Most of their differences cluster around the rack and the break, plus the APA’s ban on the push-out.
| Rule | WPA (effective Sept. 15, 2025) | CSI (BCAPL, USAPL) | APA |
|---|---|---|---|
| Ball on the foot spot | 9-ball (1-ball in front) | 1-ball | 1-ball |
| Who racks | Players agree, or rack for each other | Breaker racks their own | Opponent racks for the breaker |
| Legal break | Hit the 1 first; pocket a ball or drive 4 to rails | Same | Same, and you must break hard |
| Three-ball break rule | Yes | No | No |
| Failed break | Foul: ball in hand anywhere | Foul: ball in hand anywhere | Re-rack; same player breaks again |
| 9 on a legal break | Wins | Wins | Wins |
| 9 on a break with a scratch | Spotted, ball in hand | Spotted, ball in hand | Spotted, ball in hand |
| Push-out | Yes | Yes | Masters divisions only |
| Called shots | No | No | No |
| Jumped object balls | Stay off (9 spotted) | Stay off (9 spotted) | Spotted on the foot spot |
| Three fouls in a row | Loss of the rack | Same | No rule |
Sources: WPA Rules of Play rules 3.13 and 5.2 to 5.8, plus WPA Regulations 15, 16 and 28. On the league side, see CSI Official Rules 1-14, 1-22 and section 3, and the APA game rules at rules.poolplayers.com. Bars and house games often mix and match, so agree on the push-out and the failed-break rule before the first rack.
Strategy Tips
Run-outs in 9-ball come from cue ball position, because the order of the balls is fixed. Think at least two shots ahead: pocketing the 4-ball does you no good if you leave yourself no angle on the 5.
Every shot has two jobs. Make the ball, and leave the cue ball where the next one is easy, using spin and speed to steer it.
New players should pick a landing spot for the cue ball before every shot and judge themselves on hitting it.
When you have no clean shot at the lowest ball, play safe. Hit it, then hide the cue ball behind another ball, and your opponent is stuck with a hard kick that can easily turn into a foul and hand you ball in hand.
One equipment note: combos and caroms only behave predictably with a ball set that rolls true. If your home set is chipped or mismatched, check whether Aramith balls are worth the upgrade before blaming your stroke.
FAQ
What’s the main goal in 9-ball?
You must legally pocket the 9-ball to win. Your cue ball must first strike the lowest-numbered ball on the table, and after that any ball can legally go in a pocket, the 9 included.
Can you win 9-ball on the break?
Yes. Under WPA, CSI and APA rules, a 9-ball made on a legal break wins the rack. If the breaker scratches on that shot, the 9 gets spotted and the opponent takes ball in hand. Under WPA rules a break that fails the three-ball rule also gets the 9 spotted.
How do you rack for 9-ball?
Use a diamond rack with the 1-ball at the front and the 9-ball in the center. Current WPA rules (effective September 15, 2025) put the 9-ball on the foot spot, while APA and CSI leagues put the 1-ball on the spot. The other seven balls go in at random.
What’s an illegal break in 9-ball?
Under WPA and CSI rules, the break is a foul if the cue ball doesn’t hit the 1-ball first, or if no ball drops and fewer than four object balls reach a rail. The opponent then takes ball in hand anywhere. APA rules re-rack instead and let the same player break again.
Is there a push-out in 9-ball?
Under WPA and CSI rules, yes. After a foul-free break, the next shooter can push the cue ball anywhere without hitting the lowest ball, and the opponent chooses who shoots next. APA handicapped leagues don’t allow push-outs, though APA Masters divisions do.
Do both players have their own set of balls in 9-ball?
No. Unlike 8-ball, both players use the same set of 9 balls, and nobody is assigned solids or stripes. Both players share the same goal: legally pocket the 9-ball first.
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