Greinke pitched four innings allowing six hits and three runs with no walks or strikeouts. It'd be more encouraging if he had been better, but not much stock should be put into his spring, except his fastball velocity.
Fantasy Impact
Since last September, Greinke has lost nearly two mph on his fastball. In 2015, Greinke added two mph to his fastball after the spring, but last year his velocity did not increase once the season started. This should be something to monitor as Greinke would be a different kind of pitcher if his fastball averages around 90 mph.