horseplayer

horse·play·er

 (hôrs′plā′ər)
n.
A person who regularly bets on horseraces.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

horseplayer

(ˈhɔːsˌpleɪə)
n
(Horse Racing) a person who regularly bets on horse races
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

horse•play•er

(ˈhɔrsˌpleɪ ər)

n.
a habitual bettor on horse races.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
He explains how he did it in his book 'Beyer on Speed' and followed that with 'The Winning Horseplayer' They are both good reads, with the author spicing up the subject matter with funny stories and interesting anecdotes.
The winning horseplayer. Boston, MA: Houghton-Mifflin Co.
"Evan Shipman: Poet and Horseplayer." Southern Review (Autumn 1973): 828-856.
And he was a legendary horseplayer, which could not have endeared him to Commissioner Kenesaw Mountain Landis, who tried for years to keep baseball players like Rogers Hornsby away from the track.
Willse had been a better publisher and editor than horseplayer. He had bet wrong and it was clear he would be out, but he gave Zuckerman his best advice in transition and they parted on good terms.
Breeder:Nancy Vanier & Horseplayer's Racing Club.
Gene Courtney, a retired sportswriter who covered horse racing for the Philadelphia Inquirer until his retirement in 1981 and still handicaps for the Inquirer at a local track, said daily newspapers never really proovided all the information a serious horseplayer needed to bet.
Having already double qualified for the NHC by virtue of a pair of on-track tournament victories at Hawthorne Race Course in July and the Meadowlands in September, chasing a Tour title was not exactly something the Chicago resident and longtime successful poker player and horseplayer had as an objective.
And make no mistake, this is a serious business, costing $200 to enter for a $20,000 first prize, plus a seat at the $1 million Horseplayer World Series in Las Vegas in January 2007.