Acura-Penske
Cadillac, Acura out front as issues blight Alonso's car halfway at Daytona
Cadillac and Acura look poised to duel for overall victory in the Rolex 24 at Daytona as just four cars find themselves still on the lead lap with half of the race completed as Fernando Alonso's hopes of a podium were dashed following a brake issue through the night.