Mario Andretti easily won the Miller American 200 Indy-car race at Wisconsin State Fair Park in West Allis.

Andretti, who put his Beatrice-sponsored Lola-Cosworth on the pole the previous day with a track record lap of 147.608 mph, led all but four of the 200 laps around the flat one-mile oval.

Tom Sneva finished a distant second and Rick Mears, who held the track record before Andretti's quick lap yesterday, was third.

Danny Sullivan, Mears' teammate and the winner of the Indianapolis 500 a week earlier, was fourth, a lap behind . . .

Andretti's son, Jeff Andretti, drove to his first Super Vee victory in the Bosch-Volkswagen series event, also in West Allis . . .

Stuart Lyndon, a native of Hastings, New Zealand, was killed in a one-car crash during the running of the Georgia ARCA 500-kilometer stock car race at Atlanta International Raceway in Hampton.

"It happened coming out of the second turn on the 32nd lap, and it looked as though the car just broke loose and he lost control of it," said ARCA spokesman Ron Drager.

The race was won by Davey Allison in a Buick . . .

At Riverside, Calif., Terry Labonte outdueled Bobby Allison for the lead on the 80th lap, then pulled away to win the NASCAR Budweiser 400.

Driving a Chevrolet, Labonte finished five seconds ahead of Harry Gant, also in a Chevrolet, for his first 1985 victory.

Allison was third in the 95-lap, 400-kilometer (248.9-mile) event in a Buick.