Won When Saw Flop (WWSF) (WWSF)

Also known as: Won When Saw Flop, WWSF

WWSF is the % of hands a player wins once they have seen the flop, counting pots taken down without a showdown. Around 44–50% is solid; well below 42% marks a player who gives up too many pots postflop.

WWSF (Won When Saw Flop) is the share of hands a player wins once they have seen the flop, whether the pot ends at showdown or long before it:

\[ \text{WWSF} = \frac{\text{hands won after seeing the flop}}{\text{hands that saw the flop}} \]

The uncontested pots are the whole point. A c-bet that takes it down on the flop counts exactly like a river value bet that gets paid, so WWSF measures postflop initiative, not hand strength.

Reference bands over a normal 6-max or full-ring sample:

• 44–50%: the solid range. The player fights for the pots they enter and picks up their share of them without a showdown.
• Below ~42%: too passive postflop. They check back, give up on the turn and hand over pots uncontested. Widen your c-bets against them and fire a second barrel on almost any card.
• Above ~52%: either real aggression or heavy selection. Check it against VPIP: 53% next to a 15 VPIP is a player who only continues with the goods, 53% next to a 28 VPIP is genuine postflop pressure you have to fight back against.

WWSF is never read alone. Its partners are WTSD with its companion W$SD on one side, and the Aggression Factor or its AFq variant on the other. Two classic diagnoses:

• High WTSD + low W$SD: a calling station paying off light. Value-bet thin and big, never bluff.
• Low WWSF + low AFq: the passive profile. They win almost nothing they cannot show down, so every pot neither player wants is yours for one bet.

In tournaments the number loses resolution as stacks get shorter. At 20bb most hands are decided preflop, the flop sample shrinks, and the hands that do see a flop are usually one bet from all-in, so there is little postflop game left to win. WWSF is above all a deep-stack metric: read it inside a stack-depth bucket, not across a whole tournament career.

Like every postflop stat it needs volume. A few hundred flops is the earliest point at which the number says anything, and the bands above only become trustworthy past a thousand hands.