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Willett shot a painful 81 in the first round of the U.S. Open on Thursday<p>Minutes before his second round tee time on Friday, 2016 Masters champion Danny Willett withdrew from the 2017 U.S. Open due to a back injury.<p>Willett shot an opening round 81 on Thursday — the worst score of the field through …

Read more at CBS Sports: http://www.cbssports.com/golf/news/2017-u-s-open-2016-masters-winner-danny-willett-withdraws-with-back-injury/