Left-handers Mike Aulby of Indianapolis and John...

Left-handers Mike Aulby of Indianapolis and John Mazza of Mount Clemens, Mich., tied for the first-round lead in the $150,000 Professional Bowlers Assn.’s Hammer Open in Edmond, Okla.

Aulby, a 13-time PBA titlist, and Mazza, who has never won, averaged 259.17 for the first six games.