Buster's Daydream has some serious momentum going into the Sanford Stakes (gr. II) at Saratoga Race Course. But the going will get tough when he takes on five rivals, including Heavyweight Champ, Draw Play, and Proud Citizen, in Thursday's $100,000 Sanford.The son of Housebuster-Daydream has won three consecutive races since finishing fifth in his April debut at Aqueduct, including the grade III Flash Stakes on June 8 at 21-1. Two weeks later he walked away with a 1 1/2 length win in the grade III Tremont Stakes. John Velazquez, who won Belmont Park's Spring/Summer riding title by one victory over Edgar Prado, gets the mount on Buster's Daydream.Jan Siegel's Draw Play has started three times, winning one race while finishing second twice. The son of End Sweep enters the Sanford on the heels of a strong placing behind Buster's Daydream in the 5 1/2 furlong Tremont. Hall of Fame trainer D. Wayne Lukas who has won this race five times has a big chance to win a sixth with Robert Baker's Proud Citizen. A colt by Gone West, Proud Citizen blasted a field of eight maidens on June 28 by a little more than nine lengths. The colt completed 5 1/2 furlongs in 1:02.4/5.Another tough on to watch will be Seven Pin Stables Heavyweight Champ, who will be making only his second start. In his lone start, Heavyweight Champ competed five furlongs in :57 2/5 for a two length win.The field for Thursday's grade II Sanford includes: Heavyweight Champ (Richard Migliore); Buster's Daydream (Velazquez); Peekskill (Robbie Davis); Proud Citizen (Jerry Bailey); Draw Play (Edgar Prado); and Seeking the Money (Pat Day).