The National Museum of Racing and Hall of Fame will host five book signings during the Saratoga racing season: July 29, Bill Heller signs Graveyard of Champions; Aug. 2, "Cot" Campbell signs Rascals and Racehorses; Aug. 7, Nan Mooney signs My Racing Heart; Aug. 12, Cary Fotias signs Blinkers Off; and Aug. 19-20, Barbara D. Livingston signs Old Friends...Jockeys Michael Doyle and Ray Sibille were involved in a spill during the second race at Arlington Park Wednesday when Doyle's mount, #6 Sardinian Cat, fell in the stretch. After walking to the ambulance, Doyle, an apprentice who recently arrived the United States from Ireland, was taken directly to Northwest Community Hospital in Arlington Heights, Ill.. as a precaution after complaining of pain in his neck. Sibille, whose mount #3 Tomprado fell over Sardinian Cat, returned to the Jockey's room, but took off the rest of his mounts for the day. "I landed on my side," explained Sibille. "I'm okay but I got the wind knocked out of me, so I'll take the rest of the day off and be back tomorrow."... Three stakes races from the opening weekend of the 2002 Saratoga racing season, including live coverage of the Grade I, $250,000 Test Stakes and same-day coverage of the Grade I, $250,000 Go For Wand Handicap, highlight this week's "Road to the World Thoroughbred Championships" programs, to be telecast Saturday from 5:00-6:00 p.m. (ET) on ESPN and Sunday from 6:00-7:00 p.m. (ET) on ESPN2. Also on tap is same-day coverage of Saturday's Group I, £750,000 ($1.18 million) King George VI & Queen Elizabeth Diamond Stakes from Ascot Racecourse in England.