AVONDALE, Ariz. — NASCAR’s championship field was set Sunday at rain-soaked Phoenix International Raceway when the race was called 93 laps from the scheduled finish — denying Joey Logano and three others a chance to race their way into the finale. Dale Earnhardt Jr. won the race when NASCAR pulled the plug after a frustrating day of trying to get a pivotal Chase for the Sprint Cup championship elimination round completed. Rain initially delayed the start almost seven hours and turned a day race into a showcase under the lights, and Earnhardt inherited the lead when Kevin Harvick made a routine pit stop.