The first round of the U.S. Open was played under sunny skies and no rain at the Oakmont Country Club on June 12. The field might not be as lucky for the second round. The weather forecast calls for more of a rain chance, especially between Noon and 5 p.m. According to weatherunderground.com.

The game's stars have dominated the last six majors and most signature events. What will it take for a sleeper to emerge at Oakmont?