Meanwhile, world number one Dustin Johnson is feeling back to the form that helped him move to the top of the rankings in February.
Outside the top two, Hideki Matsuyama, who was in sparkling form when winning the WGC Bridgestone Invitational last week can be backed at 12/1, the unsafe Dustin Johnson is available at 14/1, and Rickie Fowler, who has yet to pick up his first Major but has recorded five top tens in his last seven tournaments is priced up at around 18/1. Rickie Fowler might not be the best player without a major, but he is certainly the most hyped. Here's the very best to whet your appetite ahead of what will surely be another festival of major championship golf...
The venue hosts this event annually and the 28 year old has bought the course it to its knees on more than one occasion. This is a new chapter for the event but we expect similar interest in the autumn, as was shown historically by the World Match Play Championship when it was played at Wentworth at that time of the year'.
Texas-based Lee returned to the course a fortnight later, where his tie for 32nd place at the Canadian Open was just enough to book a third straight appearance at the PGA Championship. Up until 2007, the unofficial "fifth major" was played in the weeks before The Masters. He also won twice in Japan.
This season, there are three tournaments that will take place during the National Football League regular season: BMW Championship (Sept. 14-17), Tour Championship (Sept. 21-24), and President's Cup (Sept. 28-Oct. 1).
That was the upshot from Tuesday's PGA of America announcement that the tournament, the 99th edition of which opens Thursday at Quail Hollow, would shift to May starting in 2019 at Bethpage Black.
Spieth and McIlroy are the obvious favorites, and could head into Sunday as the final pairing, but there are a couple of other players who have caught my eye as potential winners.
This adjustment will bring the end-of-season FedEx Cup play-offs forward, bringing the playing season to an early close. That's two months earlier than the 2017 date when it was played May 11th-14th. Grand Slam: Jordan Spieth can become the sixth - and youngest - player with the career Grand Slam.
Both have enviable career records and will still feel they can compete at the highest level.
The American, 24, has won three of the four majors following his victory at The Open at Royal Birkdale last month.
Time will tell how long that alliance lasts but both men are relaxed about the situation, with the dynamic between the pair during last week's WGC Bridgestone Invitational in Akron, Ohio, where the four-times major victor finished in a tie for fifth, clearly a positive one.
Phil Mickelson said moving the PGA Championship to May could strengthen fan interest. It's going to be compulsive viewing.