There are crabgrass killer sprays available but they usually require more than one application to work.

http://www.bonide.com/products/weed-control/view/066/weed-beater-plus-rts

By far, the best way to control crabgrass is to prevent it from sprouting with a well-timed application of crabgrass PREVENTER in spring.  More on that here:

https://blog.timesunion.com/gardening/finally-its-time-for-crabgrass-preventer-step-1-to-many-of-you/7124/