Andrew Guba and Jenna Williams maintained their leads on Thursday as the 2018 Teen Masters headed to its final day at South Point Bowling Plaza in Las Vegas. A total of 180 boys and 98 girls are competing in the Teen Masters, which has varsity and junior varsity divisions. After the 18 games of qualifying, Guba led the boys side by 78 pins and Williams the girls side by 176 pins. Thursday’s competition included a 6-game round for the top 25 percent of the boys field and top 25 percent...