Monday's $500,000 Diana Handicap (gr. IIT) is both the last race of the Saratoga meet and the first race of a national pick-three wager on "America's Day at the Races." The final two legs of the pick-three are the Arlington Matron Handicap (gr. III) from Arlington International and the Del Mar Handicap (gr. II). All three races in the national pick-three will be televised by TVG.Tracks participating in the national pick-three include: Arlington International, Calder, Cal Expo-Sacramento, Canterbury Park, Charles Town, Delaware Park, Del Mar, Ellis Park, Emerald Downs, The Meadowlands, Mountaineer Park, Penn National, Philadelphia Park, Prairie Meadows, River Downs, Sam Houston, Saratoga, and Three County Fair-Northampton.Probable Diana starter Colstar worked four furlongs in :47.85 on the Oklahoma training track Thursday. The work was the quickest of 11 at the distance on the day. A 4-year-old daughter of Opening Verse trained by Paul Fout for owner-breeder Beverly R. Steinman, Colstar's lone defeat on the year came in her most recent start, the New York Handicap (gr. IIT), won by likely Diana favorite Perfect Sting. Her three wins on the year came in the Locust Grove Handicap (gr. IIIT), the Gallorette Handicap (gr. IIIT), and a Pimlico allowance race.Richard Mandella trainee Reciclada, who had been listed as probable for the Diana, raced in a Thursday allowance race on the main track at Saratoga, winning by four-lengths.Others expected for the Diana are License Fee, Pico Teneriffe, Hello Soso, Fictitious, Melody Queen, and Nordican Inch. The New York Racing Association lists Mumtaz as possible.