HARNESS RACING—SPEEDY PRINCESS ($10) cut loose after favorite Meadow Farr broke stride and won the $44,780 Hudson Futurity Trot for 3-year-old fillies at Yonkers by 1� lengths over Formal Hanover. The Clearview Stables filly, driven by 67-year-old Earle Avery, trotted the 1 1/16 miles in 2:13, a record for the Hudson Futurity.
Su Mac Lad ($4) set a Yonkers mile record of two minutes with an easy victory over Air Record in the $25,000 Scott Frost Trot. The 7-year-old gelding, pulling a grateful Harold Dancer Sr. along in the sulky, trotted snappy quarters of 28 4/5, 1:00 1/5, 1:29 4/5 and 2:00.
Adios Don ($3.60) and AL SAM ($37.30) won the split divisions of the $56,000 Battle of the Brandywine for 3-year-olds at Brandywine. Adios Don paced the mile in a heady 2:00 2/5 while AI Sam tartly outstepped Sweet Miriam to win by a neck.
HORSE RACING—PRIMONETTA ($6.90), under Willie Shoemaker's direction, took an early lead in the $54,700 Alabama Stakes at Saratoga, was held under restraint awaiting the expected stretch challenge from favorite Bowl of Flowers. To everyone's surprise the Brookmeade Stable filly failed to respond to Eddie Arcaro's urging and finished third as Primonetta won by five lengths over Andrew Crevolin's Mighty Fair in a record 2:03 1/5 for the 1�-mile stakes.
Sir Gaylord ($3.60) charged from behind to capture the $123,410 Sapling Stakes for 2-year-olds at Monmouth Park by a noble 2� lengths over Armageddon's son. Battle Joined. The Christopher T. Chenery colt, now winner of six of 10 starts, ran the six furlongs under Ismael Valenzuela in a sprightly 1:10 3/5.
Beau Prince ($8.40) turned on the speed to catch a far-in-front Editorialist and win the $118,900 American Derby at Arlington Park by 2� lengths. Under the left-handed whipping of Steve Brooks the Calumet Farm's bay colt covered the 1 1/8 miles over a muddy track in 1:51 3/5.
Orleans Doge ($16.80) moved boldly at the head of the stretch and raced down the center of the track to take the $59,600 Choice Stakes at Monmouth by 1� lengths over Guadalcanal. The 3-year-old colt, with William Skuse up, ran the 1 1/16 miles in a slow 1:44 3/5.
Mr. West ($6.60), 5-year-old chestnut ridden by Pete Moore for Andy West of Dodge City, Kans.. galloped to a world quarter horse record for 870 yards with a clocking of 45.2.
MOTOR SPORTS—STIRLING MOSS of England whipped his British-made Lotus into the lead at the start and averaged 92.3 mph to stay in front throughout to win the 212-mile Grand Prix of Europe at Adenau, Germany. Second was Wolfgang von Trips, in a Ferrari, followed a second later by his stablemate Phil Hill of Santa Monica, Calif. Von Trips now has 33 points toward the drivers' world championship, Hill 29 and Moss 21.
Art Malone of Tampa, driving Mad Dog IV, a racer outfitted with winglike air foils to keep it on the ground, set a new world closed-course record of 177.479 mph on the 2.5-mile asphalt track at Daytona, Fla. Malone failed to clock 180 mph for a $10,000 prize offered by the speedway.