Daphne Custodio got off to a great with 247 in her opening game to lead compatriot, Dyan Coronacion by 44 pins. But her lead was short-lived as Del Rosario rolled a sizzling 257 to leapfrog into the lead.
Defending champion, Lara Posadas moved up into second spot, just two pins behind the leader with Custodio a further five pins away in third. Bea Hernandez and Youth Girls Masters first runner-up, Dale Lazo in the top five.
Posadas took over the running after knocking down a superb 251 in the third game. Del Rosario responded with 224 but found herself 25 pins behind the leader. Whilst Posadas added 200 in her fourth game, Del Rosario fought back with a brilliant 258 to regain the lead at the halfway mark.
The Filipina national bowler went on to reel in 221, 206, 194 and a big game of 268 to seal top spot and win the round with 1818, averaging an impressive 227.25. Posadas also ended with a strong 255 to take second spot with 1755.