PGA Championship 2015: Final Leaderboard, Top Moments from Jason Day's Win

Jason Day faced serious pressure when he stepped to the first tee on Sunday as he led the PGA Championship at Whistling Straits Golf Course in Kohler, Wisconsin.

The Australian star was used to the first page of the leaderboard when he competed in major golf championships. However, he had never been able to bring a title home in the past.

His playing partner for the final round was Jordan Spieth, who had won two majors this year and was on the verge of becoming the top-ranked player in the world. 

Not only did Day have to figure out a way to hold on to his lead, he had to do it with Spieth staring over his shoulder for 18 holes.

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"It was the hardest round of golf I've ever had to play." Watch Jason Day's news conference: http://t.co/AEXM6O6NbA pic.twitter.com/VyErVkI4Sh

— Golf Central (@GolfCentral) August 17, 2015"

That would have caused some players to crumble, but Day is made of much sterner stuff. After firing a 68-67-66 in the first three rounds, Day was playing with full confidence.

Not only had he reached 14 under par, he had a two-stroke lead on the field. Day was playing to win his first major championship, but he was also within reach of a historical performance.

No player in the history of the sport had ever scored better than 19 under par for all four rounds of a major championship. Tiger Woods had reached that level in 2000 at the British Open, and that remained the record.

When Woods set his record, he took the lead in the second round and proceeded to run away with the tournament. Day did not have that luxury. In addition to having to hold off Spieth, he also had to withstand challenges from South African Branden Grace, Brooks Koepka, Matt Kuchar, Justin Rose and Anirban Lahiri.

Day felt the pressure every step of the way, but he fired a five-under 67 at Whistling Straits to win the PGA Championship and reach a record 20 under par to set a major golf championship record.

"Not being able to finish, it would have been tough for me mentally to really kind of come back from that," Day explained after winning the tournament (h/t Associated Press). "Even though I feel like I'm a positive person, I think that in the back of my mind something would have triggered and I would have gone, 'Maybe I can't really finish it off.'

"It felt like I was mentally and physically grinding it out as hard as I could," he said. "I wasn't going to stop fighting until it over."

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Most Top-5 finishes in majors before 1st win, since 2000 Phil Mickelson 9 Jason Day 6 Jim Furyk 6 #PGAChamp

— Justin Ray (@JustinRayGC) August 16, 2015"

Winning his first major and setting a scoring record in the process are the kind of achievements that will stay with Day for a lifetime, and those are the top moments he will undoubtedly take away from the tournament.

Day's spectacular four days were keyed by his stellar putting, his crisp play from tee to green and his power off the tee. Day made 60 of 62 putts from 10 feet or less in the tournament, and he also led the field in strokes gained tee to green. His power was on display throughout, but never more so than when he bashed a 382-yard drive Sunday on the bunker-laden par-5 11th hole.

Spieth had hope that he would catch and pass Day at the start of the round, but he wasn't prepared for the champion's consistent aggressiveness with the driver.

Chris Carlson/Associated Press

"He was sitting there swinging as hard as he could off the tee, and every single drive was right down the middle of the fairway," Spieth told Kyle Porter of CBS Sports. "I wouldn't say I was surprised, but I was amazed that he kept pulling driver and kept hitting it in the tight zones. I probably would have hit 3-wood in that scenario just to keep it in play. He proved me wrong. Each time he stood and took it back, I had hope. And each time after it came off the face the hope was lost." 

Day had himself a weekend and a tournament to remember. He won his first major, set a record in the process, putted like a demon, bashed the golf ball all over the course and impressed the newly crowned No. 1 player in the world. 

All in all, it's clear that Day had the best weekend of his professional life in Kohler, Wisconsin.