Tiger Woods hasn't won a major since 2008 but is still the favourite to win at Oak Hill.
A brilliant winner of the Open Championship, Mickelson now has five major titles to his credit.
An eight-shot major winner in each of the last two years but yet to win in a troubled 2013.
The newest member of the majors club after a brilliant victory in the 2013 US Open at Merion in Pennsylvania.
Finally broke his majors duck at Augusta this year and now looks a big threat in every major championship.
Already a multiple winner this season, Kuchar is now looking to bag a first major championship.
The 2012 FedEx Cup winner is starting to become a serious contender in major championships.
The runner-up at Muirfield is in great form as be bids to become the first Swede to win a men's major.
The Northern Irishman has a strong record in the majors, highlighted by his 2010 US Open victory.
The Englishman has won some big events in recent years but still can't get it done in the majors.
Still carries the unwanted tag of one of the best players yet to have won a major.
The South African was a brilliant winner of the 2011 Masters and is now hunting a second major.
Produced final day charges to finish third in last year's USPGA and third in this year's Open.
The four-time major winner has still to add the USPGA Championship to his long trophy list.
The Spaniard has had many near misses in majors, including two second places in the USPGA.
The unorthodox self-taught left-hander has already won one major and been runner-up in another.
The American bomber has had his chances at the majors but is still looking to land his first big one.
The young Australian has taken to majors like a duck to water and has three second places already.
The 2012 US Open champion is still looking for a first win since his big breakthrough at Olympic Club.
One of the bright young things of American golf, Fowler was tied 10th in the US Open this year.