World number 266 Tiger Woods said the unfortunate "perfect storm" of surgery and a swing change has seen him suffer on course.
Tiger Woods said his back surgery and swing change was the "perfect storm" that has contributed to his career decline.
Woods is the host of the Quicken Loans National - the first event he played following his loss of the number one ranking in June 2014 - starting on Thursday.
In March '14, Woods underwent the knife on a pinched nerve in his back - and parted company with swing coach Sean Foley in August, and tweaked his action with new mentor Chris Como.
Now ranked 266th, Woods missed cuts at the U.S. Open and The Open either side of a tied for 32nd finish at the Greenbrier Classic in one example of his inconsistent form.
"I'm going through this and unfortunately sometimes I have to get a little bit worse before I can make a giant stride better," the 39-year-old told a news conference on Tuesday.
"Has it been fun going through this? No it hasn't, because obviously I am not scoring.
"I'm just not making that one key up-and-down or a bad shot. Instead of hitting it on a spot where I can play, it's a spot where I can't play.
"Rounds which should be 74s, which I used to turn into 70s, are turning into 74s if not a little bit higher.
"That's the unfortunate thing about scoring, that you need to have those opportunities and I have had chances to make those runs and just haven't done it.
"Don't forget I came off back surgery, changed my golf swing and did a polar 180 recovering from back surgery.
"Those two together is the perfect storm. And I have had to fight through the both of those at the same time."
Woods is a two-time winner of his PGA Tour event, most recently triumphing in 2012.
The 14-time major winner reserved praise for Jordan Spieth - not playing this week - who fell short of extending his Grand-Slam bid at The Open.
"I didn't realise he [Spieth] was that close to either winning the tournament or getting into the play-off," Woods said.
"For him to obviously play St Andrews for the very first time and to see it under different winds like he did and to be able to play it that well was impressive.
"Not to mention he had just won the previous week and really didn't have a whole lot of time to rest and prepare on a golf course where it really does help to know how to play it.
"You have to make a game plan and be able to make a change on the fly, and from what I saw the first couple of days when I was there, he was able to do that.
"He played really well.
"He played a couple of groups ahead of me and he had to deal with the wind delay like we did.
"And he still was able to put together an unbelievable chance to win the tournament."