The 2015 US PGA Championship was won by Australia's Jason Day.
Jason Day's maiden major was never in doubt of slipping through the Australian's fingers on Sunday, as he won the US PGA Championship at Whistling Straits by three shots.
The 27-year-old's lead for most parts of the day was 3-4 shots, as he held challengers Jordan Spieth, Branden Grace and Justin Rose at bay - with Day becoming the first golfer to card 20-under par in major history.
Four front-nine birdies - one of which came via a 40-foot putt - saw Day four clear with nine to play, and he went on to seal his third win of 2015 - and the most significant of his career.
Day signed off on a final-round 67 - better than each of his overall challengers Spieth (68), Grace (69) and Rose (70).
Spieth finished outright second on 17 under to cap a stunning year in the major tournaments - the Masters and U.S. Open champion following up his tied-for-fourth at The Open with a brilliant surge in Wisconsin.
Spieth's result was enough to see him usurp Rory McIlroy as the world number one.
South African Grace (third on 15 under) and Englishman Rose (fourth at 14 under) also celebrated strong major years with brilliant showings - the pair both finishing in the top four at Augusta, and Rose also contended at The Open with a tied-for-sixth result.
Day became the first Australian to win the PGA Championship since Steve Elkington in 1995, and the first to win a major since Adam Scott won the Masters in 2011.
Spieth shot a four-under 68 in the final round to finish 17 under for the tournament, but just could not do enough to unseat the long-hitting Day - who started the day with a two-shot lead.
The 22-year-old American broke another record, as he finished the year's four majors at a combined 54 under, one shot better than Woods' previous record of 53 under.
Grace shot a four-under 32 on the front nine as he got to within two of the lead, but he struggled on the back nine after double-bogeying the 10th.
Grace's playing partner Rose also made a Sunday charge. The 35-year-old Englishman was four under through 11 holes, but hit a couple of loose shots down the stretch.
Brooks Koepka's final-day 66 saw him finish tied for fifth - his third major top-10 result in his past seven starts.
Level with Koepka was India's Anirban Lahiri, who carded a 68 for his best finish at any major.
George Coetzee (67), Matt Kuchar (68) and Dustin Johnson (69) were further back at 12 under in a tie for seventh.
Also inside the top 10 were Tony Finau (71) and Robert Streb (67).
Rory McIlroy finished outright 17th courtesy of a final-round 69, not enough to see him hold his world number one mantle - with Spieth's result enough to usurp him.