2015 PGA Championship: Round 4 photo gallery

SHEBOYGAN, WI - AUGUST 16: Brian Gaffney of the United States celebrates with his caddie Bill Hurley after finishing on the 18th green during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Mike Ehrmann/PGA of America via Getty Images)

SHEBOYGAN, WI - AUGUST 16: Rory McIlroy of Northern Ireland hits his tee shot on the third hole during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Rory McIlroy of Northern Ireland walks off the second green during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

SHEBOYGAN, WI - AUGUST 16: A group of Jordan Spieth fans pose together during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Phil Mickelson of the United States plays his shot from the first tee during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Tom Pennington/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Boaters watch the play from Lake Michigan during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Boo Weekley of the United States hits his tee shot on the first tee near the Wanamaker trophy during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Dustin Johnson of the United States waves from the first tee during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Billy Horschel of the United States stands on the first tee during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Phil Mickelson of the United States reacts to his eagle on the sixth hole during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Jason Day of Australia his tee shot on the first hole during the final round of the 2015 PGA Championship at Whistling Straits at on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Jason Day of Australia (L) greets Jordan Spieth of the United States on the first tee during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States watches his tee shot on the first hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Herb Kohler (L) greets Jordan Spieth of the United States on the first tee during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: The Wanamaker trophy is seen on the first tee during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Jason Day of Australia plays a bunker shot on the second hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States walks off the third tee with his caddie Mike Greller during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Tom Pennington/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Justin Rose of England walks across the first green during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States (L) and Jason Day of Australia walk off the fourth tee during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Mike Ehrmann/PGA of America via Getty Images)

SHEBOYGAN, WI - AUGUST 16: David Lingmerth of Sweden walks across the 18th green after shooting a six-under par 66 during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Andrew Redington/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Tony Finau of the United States watches his tee shot on the fifth hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Andrew Redington/Getty Images)

SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States reacts to a poor shot during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

Dustin Johnson of the United States walks off the first green during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

Jordan Spieth of the United States plays a bunker shot on the 16th hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

Justin Rose of England reacts to a shot on the 15th hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Tom Pennington/Getty Images)

Jason Day of Australia (L) and Jordan Spieth of the United States walk up the 16th fairway during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

Jason Day of Australia celebrates on the 18th green with his son Dash and wife Ellie after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

Jason Day of Australia celebrates on the 18th green after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

Jason Day of Australia celebrates on the 18th green with his wife Ellie after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

Jason Day of Australia celebrates with his caddie Colin Swatton on the 18th green after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Andrew Redington/Getty Images)

Jason Day of Australia celebrates with his caddie Colin Swatton on the 18th green after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

Jason Day of Australia walks off the 18th green with his son Dash after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

Jason Day of Australia hugs his caddie Colin Swatton on the 18th green after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)

Jason Day of Australia celebrates with the Wanamaker trophy after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

Jordan Spieth of the United States (L) greets Jason Day of Australia after Day’s three-stroke victory at the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Tom Pennington/Getty Images)

Jason Day of Australia celebrates with the Wanamaker trophy after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by David Cannon/Getty Images)

Jason Day of Australia poses with the Wanamaker trophy after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by David Cannon/Getty Images)

Jason Day of Australia celebrates with his son Dash after winning the 2015 PGA Championship with a score of 20-under par at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by David Cannon/Getty Images)