BROOKLYN, Mich. Greg Biffle never considered pitting during the last caution period Sunday at Michigan International Speedway.
Instead, he stayed on track with slightly worn tires and turned that decision into his fifth Nextel Cup victory in 15 starts this season.
Biffle, in his third full season in NASCAR's top stock car series, is beginning to make winning races look easy.
He outdueled and outfoxed Tony Stewart on Sunday in winning the Batman Begins 400 on Michigan's 2-mile oval, earning his eighth career victory.
The powerful Roush Racing team, winner of the last two season championships, got its eighth win of the season. It was another strong showing for the entire team, with three of Biffle's four teammates finishing in the top five and the fifth driver, defending series champ Kurt Busch, fading to 12th after running in the top 10 throughout most of the 200-lap event.
Stewart led a race-high 97 laps, but lost a strategy battle at the end.
Biffle, who led 63 laps, was running second to Stewart when he decided to stay on the track during a late caution as the front-runner and several of the other lead-lap cars pitted for fresh tires with 31 laps to go. Biffle and the rest of the leaders had pitted only about a dozen laps earlier.
''It was my decision,'' Biffle said. ''I wanted to lead and there was no doubt in my mind that we had a fast enough car to beat those guys. It's just so hard to pass here. And I was hoping enough of those guys would stay out with us that Tony would have to burn up his tires trying to get back to us.
''If everybody behind us had gone in, we could have been a sitting duck. But we had four or five of those guys stay out there with us.''
The drivers who did stay out were Roush teammates Matt Kenseth, Carl Edwards and Busch, as well as Elliott Sadler.
Playing into Biffle's hands, Joe Nemechek and Michael Waltrip also beat Stewart back onto the track, leaving him eighth for the restart on lap 174.
Stewart, trying for his first win since last August at Watkins Glen, got all the way to third by lap 178, but it took him until lap 198 to get past Kenseth, the 2003 series champion.
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