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Jason Day of Australia looks over the fourth green with his caddie Colin Swatton 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)

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Jason Day of Australia 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 Jamie Squire/Getty Images)

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Jason Day of Australia hits his tee shot on the sixth hole 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)

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Jason Day of Australia lines up a putt on the sixth 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)

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Jason Day of Australia plays a bunker shot on the eighth hole as a group of officials look on 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)

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Jason Day of Australia throws his club on the 13th 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)

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Jason Day of Australia plays a shot from the rough 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 Jamie Squire/Getty Images)

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Jason Day of Australia reacts to a missed putt 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 Kevin C. Cox/Getty Images)

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Jason Day of Australia reacts to a missed eagle putt on the 16th green 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)

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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)

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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)

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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)

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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)

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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)

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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 Andrew Redington/Getty Images)

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Jason Day of Australia kisses 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 Richard Heathcote/Getty Images)

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Jason Day of Australia poses with the Wanamaker Trophy and his wife Ellie and 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 Andrew Redington/Getty Images)