The New York City Off-Track Betting Corporation and Churchill Downs are teaming up to giveaway 2,500 "mystery vouchers" on April 25. The vouchers will be distributed in front of NASDAQ headquarters at 43rd St. and Broadway before the opening of the market. Raymond Casey, president and CEO of NYCOTB and Tom Meeker, president and CEO of Churchill Downs, will assist in the giveaway.Meeker will open the NASDAQ market at 9:30 a.m. in celebration of the company's 10th anniversary of trading on the Nasdaq market. NBC Sports president Kenneth Schanzer, Jockey Club president Alan Marzelli, Casey, Wall Street area analysts and Kentucky Derby jockeys will join him.The vouchers can be redeemed at any New York City OTB branch or restaurant location on Derby Day, May 3. The vouchers will have various values up to a maximum of $20. The holder of the vouchers will have the opportunity to wager on the Kentucky Derby or any other race being broadcast at NYCOTB on Derby Day.