By NICHOLAS K. GERANIOS When Texas A&M guard Derrick Roland broke his leg in December it forced some drastic lineup changes for the Aggies, including freshman Khris Middleton being moved into the starting lineup.He played OK, then averaged a solid 15 points in three Big 12 tournament games.But Middleton erupted for a career-high 19 points as fifth-seeded Texas A&M crushed 12th seed Utah State 69-53 on Friday in the first round of the NCAA tournament's South Regional."Going into the game, I was a little nervous," the 6-foot-7 Middleton said.