Chris Gibbons of Madison took the Petersen Classic lead with 1,603 on Monday, edging past the 1,596 of Adam Barta and putting him in line for the estimated $20,000 top prize. Starting on lanes 3 and 4 at Brunswick Zone River Grove in suburban Chicago, Gibbons rolled games of 204, 179, 208, 217, 178 on notorious lanes 11-12, 200, 201 and 216 closing on 1-2. Gibbons said in a phone interview that he started his last game with a chop of the 5-9 on 1-2 when the machine set the pins far apart...