Defending champion Bobby Allison grabbed the lead on the 286th lap and outdueled Ricky Rudd to win the Richmond 400 NASCAR Grand National race.

Allison, averaging 79.381 mph in his Buick, edged Rudd's Chevrolet by less than three seconds. Darrell Waltrip, driving a Chevrolet, came in third.

Allison pocketed $39,905 of the $235,000 in prize money. It is the largest short-track purse on the NASCAR circuit. "My car ran real good today," Allison said. "But NASCAR won't let me put a sun roof in, so it was hot in there" . . .

In Monza, Italy, Brazilian Nelson Piquet drove his turbo-charged Brabham car to victory in the Grand Prix of Italy race and narrowed Alain Prost's lead in the Formula 1 world championship standings.

France's Rene Arnoux, in a Ferrari, finished second. Prost, the French ace of Renault, withdrew in the 27th lap and was left with 51 points in the standings. Arnoux has 49 points overall . . .

Teo Fabi outdistanced the field to run off with an easy victory in the Escort Radar Warning 200 Indy-car race at Mid-Ohio Sports Car Course in Lexington, Ohio. Fabi drove his March-Cosworth racer across the finish line 26 seconds ahead of Mario Andretti's Budweiser Lola-Cosworth . . .

Scottish driver Jim Crawford edged Canadian Jacques Villeneuve by 1.7 seconds to win the Labatt's Can-Am sports car race in Mosport, Ontario, and jump ahead of Villeneuve in the series point standings.