Jason Day has imploded during the third round of the US PGA Championship to give away a solid chance at a second career major.
After starting day three of the year's final major just two shots off the pace, the Australian world No.7 crashed out of contention spectacularly with a six-over-par 77 at Quail Hollow in North Carolina.
The 2015 US PGA Championship winner Day plummeted to a share of 16th at even-par, seven shots back of leader Kevin Kisner.
The American Kisner also battled to a rollercoaster 72 but at seven-under the card the South Carolina native clung to a one-shot lead over world No.3 Hideki Matsuyama (73) and Chris Stroud (71).
Justin Thomas (69) and 2010 British Open winner Louis Oosthuizen (71) share fourth a shot back at five-under.