100th PGA Championship: Thursday

A detail of the bag of Rickie Fowler of the United States (not pictured) during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Richard Heathcote/Getty Images)

Hideki Matsuyama of Japan plays a shot on the 11th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Stuart Franklin/Getty Images)

Justin Thomas of the United States plays his shot from the tenth tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Stuart Franklin/Getty Images)

Ian Poulter of England stands on the 14th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Ross Kinnaird/Getty Images)

Rory McIlroy of Northern Ireland plays a shot on the tenth hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Stuart Franklin/Getty Images)

Tiger Woods of the United States reacts on the 11th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Andy Lyons/Getty Images)

Bryson DeChambeau of the United States plays a shot from a bunker on the fourth hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Jamie Squire/Getty Images)

Jason Day of Australia plays his shot from the 13th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Richard Heathcote/Getty Images)

ST LOUIS, MO - AUGUST 09: Tiger Woods of the United States walks off the 18th green during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Andy Lyons/Getty Images)

ST LOUIS, MO - AUGUST 09: Danny Willett of England plays his second shot on the 10th hole during the first round of the 100th PGA Championship at the Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by David Cannon/Getty Images)

ST LOUIS, MO - AUGUST 09: Rory McIlroy of Northern Ireland lines up a putt on the 13th green during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Andy Lyons/Getty Images)

ST LOUIS, MO - AUGUST 09: Tiger Woods of the United States watches his shot from the 15th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Andy Lyons/Getty Images)

ST LOUIS, MO - AUGUST 09: Justin Thomas of the United States plays his shot from the 17th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Stuart Franklin/Getty Images)

ST LOUIS, MO - AUGUST 09: Tiger Woods of the United States plays his shot from the 18th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Stuart Franklin/Getty Images)

ST LOUIS, MO - AUGUST 09: Tiger Woods of the United States plays his shot from the 16th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Richard Heathcote/Getty Images)

ST LOUIS, MO - AUGUST 09: Rickie Fowler of the United States plays a shot on the 16th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)

ST LOUIS, MO - AUGUST 09: Phil Mickelson of the United States plays a shot on the 15th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Richard Heathcote/Getty Images)

ST LOUIS, MO - AUGUST 09: Jason Day of Australia plays a shot on the 16th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)

ST LOUIS, MO - AUGUST 09: Tiger Woods of the United States plays a shot on the 18th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)

ST LOUIS, MO - AUGUST 09: Rory McIlroy of Northern Ireland and Justin Thomas of the United States stand on the 16th green during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)

ST LOUIS, MO - AUGUST 09: Tiger Woods of the United States lines up a putt on the 15th green during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)

ST LOUIS, MO - AUGUST 09: Tiger Woods of the United States plays a shot on the 15th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)

ST LOUIS, MO - AUGUST 09: Billy Horschel of the United States plays his shot from the 18th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Ross Kinnaird/Getty Images)

ST LOUIS, MO - AUGUST 09: Justin Thomas of the United States plays a shot on the 17th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Stuart Franklin/Getty Images)

ST LOUIS, MO - AUGUST 09: Jordan Spieth of the United States plays a shot from a bunker on the ninth hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Richard Heathcote/Getty Images)

ST LOUIS, MO - AUGUST 09: Tommy Fleetwood of England walks on the 15th hole during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Andy Lyons/Getty Images)

ST LOUIS, MO - AUGUST 09: Gary Woodland of the United States plays his shot from the 18th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Stuart Franklin/Getty Images)

ST LOUIS, MO - AUGUST 09: Jon Rahm of Spain stands on the 18th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Jamie Squire/Getty Images)

ST LOUIS, MO - AUGUST 09: Dustin Johnson of the United States acknowledges the crowd on the 11th green during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)

ST LOUIS, MO - AUGUST 09: Adam Scott of Australia plays his shot from the 17th tee during the first round of the 2018 PGA Championship at Bellerive Country Club on August 9, 2018 in St Louis, Missouri. (Photo by Streeter Lecka/PGA of America/PGA of America via Getty Images)