AVONDALE, Ariz. — Ryan Blaney earned his first NASCAR victory in style Saturday at Phoenix International Raceway with a triumph in his NASCAR K&N Pro Series West debut in the Casino Arizona 125. Blaney, the 17-year-old son of NASCAR Sprint Cup Series driver Dave Blaney, took the lead for the third and final time on Lap 104 and cruised to victory following a spirited battle with Alex Bowman that saw the pair swap the lead five times through the race’s final 55 laps. In the end, Blaney crusied to the victory by more than two seconds. From High Point, NC, Blaney had just two starts in the NASCAR K&N Pro Series prior to Saturday, both in the East division. He registered top 10s in those outings at Richmond International Raceway and Iowa Speedway. Bowman settled for second after also leading the race on three different occasions. Chase Elliott, Eric Holmes and Derek Thorn brought home the top five. For Bowman, a native of Tucson, Ariz., the Casino Arizona 125 was a homecoming after competing full-time in the K&N Pro Series East in 2011, where he won Sunoco Rookie of the Year honors. The 18-year-old had one other West start this year, a ninth-place finish at Colorado National Speedway. Daniel Suarez, Chad Boat, Brandon Davis, Johnny Borneman and David Mayhew rounded out the top 10 finishers in the K&N Pro Series West season finale. After clinching the 2011 K&N Pro Series West title with one race to go, Greg Pursley celebrated with the championship trophy at Phoenix. The Casino