Rockies rookie right-hander Antonio Senzatela understood early that pitch No. 1 -- the fastball -- was also job No. 1. Senzatela has relied mainly on his fastball, which he has spotted to all corners of the strike zone, to pitch to a 1.50 ERA in his first two Major League starts, and he hopes to continue his success on Sunday against the Giants and righty Jeff Samardzija.