The Arizona Diamondbacks' mantra all season has been to keep pushing, a familiar refrain used by manager Kirk Gibson. They haven't let up one bit. Gerardo Parra tied a career high with four RBIs to back seven strong innings by Joe Saunders and the Diamondbacks rode a five-run sixth inning to a 7-2 victory over the Los Angeles Dodgers on Monday night, reducing their magic number to seven for clinching the NL West title.