1) OTB client 2) Belmont customer 3) Belmont player 4) Better 5) Casino client 6) Casino customer 7) Casino patron 8) Certain ticket holder 9) Exacta placer 10) Exacta player 11) Gambler 12) Guest at a casino 13) High roller 14) Horseplayer 15) Odds-taker 16) One may have chips 17) One taking a chance Found on https://www.crosswordclues.com/clue/bettor