Dale Earnhardt, Jr.

NASCAR driver Kasey Kahne retiring after 15 Cup seasons

Kasey Kahne announced Thursday that he will retire from full-time racing in NASCAR and plans to focus on the sprint car team he owns.

Kahne said in a Twitter post that he is at ease with the decision after 15 years racing in NASCAR. Kahne, from Enumclaw, Washington, made it to NASCAR via sprint car racing and his Kasey Kahne Racing team competes in the World of Outlaws series.

KKR driver Brad Sweet won the prestigious Knoxville (Iowa) Nationals last weekend and the 38-year-old Kahne was present for the victory.

"I'm not sure what the future holds for me," Kahne said. "The highs don't outweigh the lows and the grueling schedule takes a toll on your...