Michael Haugen Jr. kept grinding in Tuesday’s second round of the Suncoast PBA Senior U.S. Open presented by Storm and extended his lead from a pin to 24 pins over PBA Hall of Famer Mark Williams. The defending Senior U.S. Open and 2017 PBA50 Rookie of the Year followed his 1,370 first-round total with 1,399 in the second round on games of 267, 223, 193, 276, 244 and 196 in the second round at the Suncoast Bowling Center in Las Vegas for a 2,769 12-game total (230.7 average) on the PBA...