This week's final major tournament of the year at Bellerive Country Club is the last United States team qualifying event.
Spieth's dramatic Open triumph at Royal Birkdale in 2017 means he needs victory in the US PGA to join Gene Sarazen, Ben Hogan, Gary Player, Jack Nicklaus and Tiger Woods in having won all four majors.
With heavy downpours on Tuesday, several long suspensions in play forced many in the field to abandon practice rounds at a soggy Bellerive Country Club in St Louis, Missouri.
"You certainly get thrown at the deep end straight away in a group like that", McIlroy said. "Looking forward to watching it all unfold!"
Ninth-ranked Rickie Fowler and Webb Simpson, the 2012 US Open champion, hold the last two places but a host of rivals are within reach, the nearest being Bryson DeChambeau and five-time major victor Phil Mickelson.
"The ball is just plugging (when it lands), and if anything, it favours a guy who hits the ball high because we're not going to get any run".
"I might put a few noses out of joint by saying, but in my opinion, (he's) the best player that's ever played the game", said Bjorn.
And all these good players you see now, these superstars will now play the ball one way or the other. His last Tour win came at the 2013 WGC-Bridgestone and he claimed his most-recent major at the 2008 U.S. Open at Torrey Pines. He lost in a playoff to Sergio Garcia at the Masters past year, and twice he's been top 5 at the PGA. He had to learn how to swing. "I know technology allows them to do it a little bit, from a technical standpoint, being able to trap the ball - I've been playing a long time and I'm still trying to figure out how to trap it enough to be consistent and keep the ball online". "He just had his fourth back surgery, so to get to this point is a phenomenal achievement already". They're going to look at if you win or lose. McIlroy tied for sixth in the same event last week, his first tournament after tying for second at the British Open three weeks ago. I think there was like a couple of clubs that I might have needed one, but it was all right. I did a lot of clinics around the country and tried to raise money for the local areas and try to bring awareness...
But the 29-year-old has also struggled to convert several other opportunities, most notably when chasing the career Grand Slam in The Masters and failing to convert a three-shot halfway lead in the BMW PGA Championship at Wentworth. Woods hasn't played the tournament since 2015.
Kerry Haigh of the PGA of America took what some considered a subtle shot at the USGA when he said Tuesday his goal in setting up courses for the PGA Championship is to let the players be the stars.
ST. LOUIS - Jim Furyk can defer a decision on Tiger Woods and the Ryder Cup for a few more weeks, but the US captain admitted Wednesday he was surprised the 14-time champion discussed being part of the team as a player back in January.
'I feel somewhat under the radar this year.
Francesco Molinari, whose British Open win made him the first Italian golfer to win a major, is hoping for a historic double.
"It's going to be the quintessential target golf", McIlroy said.
Bellerive is a long course and the popular theory is that it will favour bigger hitters.
"Even though it's going to be softer and wet, it's got the potential for I think anybody to work their way up the board", Spieth said.
"I'll try as hard as I can", Woods said.
Quoteworthy: "I've had a really good year so far". "We're going to have some putts and they're going to kind of wobble off line". They had massive greens, and you became a little lazy with that fact.
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