Cassidy Schaub (left), the top American two-handed bowler, soared into the overall lead Friday after 10 games at the 2007 Panama Invitational Tournament.

Schaub, who mirrors two-handed rival Jason Belmonte (right) of Australia by throwing the ball from the left side, had a blockbuster finish to his five-game set Friday, closing with games of 280 and 278 for a 10-game total of 2,354.

"It was totally different for me today because I bowled second shift and didn't have to loft the ball to the arrows like I did last night on the last squad," said Schaub, who also had games of 236, 244 and 228 in his five-game block of 1,266. "I was able to get more comfortable and make better shots."

Schaub is trailed by a pair of fellow Americans in the open division standings. Denny's PBA Tour player Brian Kretzer (left) totaled 1,206 for five games in the second round and sits in second with 2,345. Kenny Simard is third with 2,329.

Colombian Manuel Otalora is fourth with 2,320 after closing with games of 266 and 269. A pair of English bowlers are next with Paul Moor sitting fifth with 2,300 and World Ranking Masters champion Stuart Williams (right) sixth at 2,297.

The lone Asian Bowling Federation competitors, Australians Jason Walsh and Belmonte, are 11th and 42nd respectively.

Walsh (left) had a solid block of 1,179 and has a two-round total of 2,267. Belmonte, meanwhile, seems to be kicking into gear as he closed his set Friday with games of 259, 268 and 244 to bolt up the standings with a 10-game total of 2,098.

In the women's division, World Ranking Masters champion Diandra Asbaty (right) of the United States put together a solid block of 1,114 despite having games of 189 and 185. She leads with a 10-game total of 2,164.

First-round leader April Ellis fell to second after a disappointing Round of 994. Her 2,143 is 19 pins better than Felicia Wong of Canada, who is third at 2,124.

American Kelly Kulick sits in fourth with 2,107 while Canadian Robin Orlikowski (left) had the high five-game block of the day for the women with 1,144 and is fifth with 2,103.

American Vince Mazzanti (right) put together the highest five-game block by a senior bowler for the tournament as he had games of 247, 237, 267, 216 and 223 for 1,190. He leads the senior division with 2,261.

"I was very worried coming into today bowling third shift," Mazzanti said. "But I was able to change my release and had good ball reaction the whole time."

Mazzanti leads a host of Americans who dominate the senior division. Players from the United States occupy the top nine spots and 14 of the top 15. Mike Dias sits in second place with 2,194 and is followed by Gordon Vadakin with 2,171, Darrel Curtis (left) with 2,163 and Steve Fehr with 2,148. Mexico's Alfonso Rodriguez broke up the American stronghold in 10th place with 2,099.

All players return for the third and final five-game qualifying block on Saturday. The field will then be cut to the top 24 in the open division and the top 12 in the women's and senior divisions for six games Sunday morning before the top five in each division advance to the stepladder finals.

After the second round Friday, American Jeff Fehr (right) occupies the 24th spot in the open division with 2,203. For the women,

Wendy Macpherson (left) of the United States is 12th with 2,007 despite opening the tournament with a score of 882.

A familiar face sits in 12th for the seniors as American Mark Roth (right) has a total of 2,064.

The total prize fund for the event is more than $300,000. The winner in the open division will claim $40,000, the women’s winner will take home $15,000 while the champion among the seniors will also win $15,000.

After the three champions are determined, they will compete in a King of the Hill match, with an additional $5,000 going to the winner of that battle.