Tiger Woods tunes up on Tuesday at Shinnecock Hills, where he finished 17th in 2004 Three-time champion Tiger Woods says playing in the US Open for the first time since 2015 is a “pure bonus”. Woods had his fourth back operation in three years in April 2017, and watched last year’s US Open on television. “This time last year I had just been given the OK to start walking again,” said Woods, who partners Justin Thomas and Dustin Johnson at Shinnecock Hills on Long Island on Thursday. “I had no expectation of getting this far,” the 42-year-old added. Woods won the last of his 14 majors a decade ago, the US Open in 2008, while recovering…