PONTE VEDRA BEACH, Florida (AP) ― Tiger Woods described his recovery from back surgery as a “very slow process” that offered him no timetable on when he can return for a summer filled with big championships.

Woods already missed the Masters, choosing to have microdiscectomy surgery March 31 to relieve pain from a pinched nerve.

In a wide-ranging blog on his website Monday, Woods said he is still sore from the incision and his only contact with golf clubs is a few putts and chips that do not require him to rotate his back. He said tests showed no arthritic changes, which he attributed to being in good shape and strong in his legs and abdomen.

“I made the decision to have surgery because physically I just couldn’t make a golf swing,” Woods wrote. “The pretty much sums it up.”

Though he is uncertain when he can even start hitting half-shots, Woods made it sound as though he would not be ready for the U.S. Open on June 12-15 at Pinehurst No. 2, the major championship course where he has the most experience.

“As I’ve said several times, I hope to be back sometime this summer, but I just don’t know when,” Woods said.

The one nonmajor that is important to him is the Quicken Loans National at Congressional, with a new title sponsor stepping in at a tournament that benefits his foundation.

“Whether I’m able to play or not, I’m going to be there to support it,” Woods said.

That tournament is two weeks after the U.S. Open and three weeks before the British Open, with the PGA Championship, FedEx Cup playoffs and Ryder Cup filling out a busy lineup of big-time golf.

“You can understand why I want to hurry up and get better,” Woods said.

Woods, who last played March 9 at Doral, said all he could do was to follow a strength program, listen to the doctors, chart his progress and wait.