IMOLA, Italy (AP) — When Ayrton Senna crashed into a concrete wall during the 1994 San Marino Grand Prix, a routine day of race coverage transformed into a marathon effort of wall-to-wall reporting for Associated Press writer Piero Valsecchi. "I have to admit that I immediately understood it was going to be a heck of a day," the now-retired Valsecchi said ahead of Thursday's 20th anniversary of Senna's death.Read more on NewsOK.com