Sin, who won her first PWBA title at the 2017 Pepsi PWBA Lincoln Open, Nebraska, leads a field of 124 players with a total of 2268 averaging of 252.00 from nine games including handicap of seven pins each game.
The Malaysian was lying in 18th overnight and the first bowler who surpassed the 800-mark with 820 (279, 286 and 231) but improved with 745 and 703 to leapfrog into pole position. Kyle Troup of Taylorsville, N.C., settled for second position with 2205 after leading for the past three days.
Michael Tang of San Francisco, Cal., improved his fifth place finish to third with 2203. 2015 Japan Bowling World Open champion, Osku Palermaa of Finland finished fourth with 2175 pushing down four-time JPBA triple crown champion, Shota Kawazoe from second to fifth on 2170.
2017 World Championships Masters gold medallist, Francois Lavoie of Canada dropped from third to sixth position with 2167 while defending champion, Yannaphon Larpapharat of Thailand clinched the seventh and final Round 4 finals spot with 2160.