The 2018 U.S. Open provides one day that harkens back to the challenge the major tournament offered for most of this century, two interesting patterns that look to be very challenging for the 144-player field, and a main pattern that is a virtual copy in shape of the 2015 U.S. Open pattern. As I wrote in this U.S. Open preview, in the years the PBA had control of the U.S. Open this century, the tournament developed a distinct identity as undeniably the toughest test in bowling with a flat lane...