Hall of Famer Norm Duke averaged better than 231 to maintain a solid lead after Tuesday’s second round of the Suncoast PBA Senior U.S. Open presented by 900 Global at the Suncoast Bowling Center in Las Vegas, PBA reported.  After firing a gigantic 1,488 in Monday’s first round, the Storm staffer and 2014 Senior U.S. Open champion rolled games of 237, 212, 289, 220, 224 and 206 for 1,388 in the second and 2,876 overall (239.6 average). Non-PBA member Mike Klosin of...