AVONDALE, Ariz. (AP) — Kevin Harvick has been nearly unstoppable since he charged to his first Sprint Cup championship last season.The overwhelming favorite to win today’s race at Phoenix International Raceway, Harvick could realistically have a shot at a three-race sweep of NASCAR’s current West Coast swing. He picked up his first win of the season last week at Las Vegas, has proved himself almost unbeatable at Phoenix, and has had strong showings at California, next week’s venue.Although the possibility exists that he could sweep this trip, Harvick said his Stewart-Haas Racing team has not discussed it once.“We never talk about stuff like that,” he said. “We don’t talk about things we’ve done.