US PGA Championship 2015: Jason Day leads the way but Jordan Spieth prowls

Australia's Jason Day will take a two-shot lead into the final day of the US PGA Championship after carding a six-under round of 66 to pull ahead at Whistling Straits. Six times a top five finisher in major championships, the fifteen-under Day will be joined in the final group by American Jordan Spieth, who is in contention for a third major of the year after three straight birdies concluded a round of 65 to leave him two behind.

The 2013 US Open champion Justin Rose and South Africa's Branden Grace, who produced the lowest round of day three of 64, are a further shot back on twelve-under. Martin Kaymer, champion in Wisconsin five years ago, is on eleven-under and will start round four, four shots back just as he did on his way to victory in 2010.

But in another wide-open major championship in 2015, there remain a host of other contenders ready to take advantage of any slip ups from the leading groups. Tony Finau and Matt Jones - the outright leader by shots after the conclusion of round two - are among them on ten-under.

Round one leader Dustin Johnson and Indian Anirban Lahiri are on nine-under ahead of three American players on eight-under which include Matt Kuchar, Billy Horchel and J.B Holmes. Boo Weekly hit a third round 65 to thrust his way into the top 17 and is level with Rory McIlroy, who began in encouraging fashion before tailing off.

The world number one and two-time PGA champion opened up with two birdies and an eagle in his first five holes but a string of dropped shots followed as he dropped out of contention. Should Spieth prevail and claim a third major championship of his career, McIlroy will be replaced at the top of the PGA rankings if he unable to finish outright second.

The end to round two, after an electrical storm had brought a premature end to play on day two, confirmed the exit of Tiger Woods from the 97th PGA Championship after he failed to make the cut for the third successive major of the year.