Centennial’s baseball team had done a good job of keeping Northern champion Spanish Springs from having a big inning at the plate during the opening day of the Class 5A state tournament. Then the sixth inning happened at Thursday’s meeting between the two teams. Entering the inning trailing by two runs, Spanish Springs exploded for five runs in the sixth. The late rally was too much for Centennial to overcome, and the Bulldogs, the South’s No. 2 seed, fell to the North’s No. 1 Cougars 7-4 at Las Vegas High. Centennial (27-12) drops to the losers bracket and will play Bishop Manogue, the North’s No. 2 seed, in an elimination game at 10 a.m. Friday at Las Vegas. “(It’s the) first time for really any of these kids to be on this stage and we kind of got out of our game plan a little bit,” Centennial coach Chris Martinez said. “We just got to focus, again, one game at a time. We got a 10 a.m. game (Friday) and concentrate on that.” In Thursday’s other opening-round game, Bishop Gorman, the South’s No.…