Ever since he became the youngest Daytona 500 winner, in February, Trevor Bayne, 20, has been learning a hard truth: Winning NASCAR's biggest race doesn't guarantee happiness. Not only was he briefly hospitalized two weeks ago with an insect bite to his elbow, but he has also struggled on the track. Since Daytona, Bayne has finished no higher than 17th. On Sunday he crashed into the wall and finished 40th... . Last week Greg Biffle (16th in the standings) signed a three-year extension with Roush Fenway Racing. Next up for owner Jack Roush: re-signing Carl Edwards, the current points leader, whose contract expires at season's end. Expect Roush and Edwards, who are extremely close, to reach a long-term deal by midsummer.