A weather-delayed opening day created challenges and opportunities for the field with Rory McIlroy in touch after his first round

The USGA set up a different course at Shinnecock Hills to handle strong wind Thursday. When the wind subsided later, Wyndham Clark seemed to play a different U.S. Open.

Rory McIlroy was in a larger group on one under but would have been higher had he not bogeyed his final two holes.

Rolling report: Join our writers for updates from the second round at Shinnecock Hills

Wyndham Clark has the lowest opening round at Shinnecock Hills in U.S. Open history

The Masters champion was four shots behind the leader at the turn at Shinnecock Hill.