John Andretti, a longtime competitor in NASCAR, IndyCar and sports-car racing, died Thursday. He was 56. The Andretti Autosport team confirmed his passing after a long battle with colon cancer, which he was diagnosed with in 2017. “We will forever carry with us John’s genuine spirit of helping others first and himself second,” a statement from the Andretti team read in part. “John Andretti embodied the spirit of a champion and inspired an entire fan base through his courageous battle with cancer,” NASCAR President Steve Phelps said in a statement. “He was a fierce competitor throughout his life, and we...