Northern Ireland's Rory McIlroy looks for his ball in the long rough on the 1st hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

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The 148th Open Championship at Royal Portrush Golf Club

Northern Ireland’s Rory McIlroy looks for his ball in the long rough on the first hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Peter Morrison / Associated Press)

Alexander Bjork of Sweden plays a shot on the 18th hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Stuart Franklin / Getty Images)

Rory McIlroy of Northern Ireland plays his shot off the 7th tee during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Rory McIlroy of Northern Ireland tees off on the seventh hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Mike Ehrmann/Getty Images)

Gary Woodland of the United States attempts to find a sure footing to play his ball that is on the top edge of a bunker on the 7th hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Gary Woodland of the United States climbs the steep wall of a bunker while attempting to find sure footing to play his ball on the top edge of the bunker on the seventh hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Peter Morrison / Associated Press)

Tiger Woods of the United States plays his tee shot on the 5th hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Tiger Woods of the United States plays his tee shot on the fifth hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Jon Super / Associated Press)

Graeme McDowell of Northern Ireland looks on the 5th green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Graeme McDowell of Northern Ireland waits to play on the fifth green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Mike Ehrmann / Getty Images)

England's Ian Poulter arrives on the 13th green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Golfers arrive on the 13th green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Glyn Kirk / AFP/Getty Images)

Tiger Woods of the United States walks towards the 3rd tee during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Tiger Woods walks toward the third tee during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Jon Super / Associated Press)

Phil Mickelson of the United States plays a shot on the 16th hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Phil Mickelson plays a shot after missing the green on the 16th hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. Mickelson bogeyed the par-three and shot five-over 76. (Stuart Franklin/Getty Images)

Jason Day of Australia tees off the 7th during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Jason Day of Australia tees off on the seventh hole, foreground, during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Andrew Redington / Getty Images)

England's Paul Casey plays his shot to the 8th green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

England’s Paul Casey chips onto the eighth green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Peter Morrison/Associated Press)

Bryson DeChambeau of the United States prepares to play a putt on the 4th green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Bryson DeChambeau of the United States prepares to putt on the fourth green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Francois Nel / Getty Images)

Northern Ireland's Rory McIlroy plays his approach shot to the 7th green during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland.

Players contend with the undulating, zigzagging seventh hole during the first round of the 148th Open Championship at Royal Portrush Golf Club in Northern Ireland. (Matt Dunham/Associated Press)