The 20-cent Rainbow pick six pool swelled by $3,003,292 on Sunday's closing program of the autumn meeting, a day with a mandatory payout.

The bet began with a carryover of $436,836 from Thursday. The Rainbow pick six was not offered on Friday and Saturday on the Breeders' Cup program.

The pick six covers the fourth through ninth races on Sunday. In the first race, Oil Can Knight ($3.80) obliged as a strong favorite in a sprint for $20,000 claimers.