Greinke has been phenomenal so far. 0 earned runs until tonight. He allowed his only 2 of the season tonight in the 1st two innings. Besides that, though, he was outstanding. 8 Ks/2 BBs in 7 innings, giving him a ridiculous 44/8 on the season, and tonight was one of the tighter strike zones I've seen in a while. He's only allowed 2 base hits in 3 of his 36 innings this year, and not more than 2 yet.
Also, you could mention that he's actually been unlucky so far, judging by his BABIP, which, before tonight, was about 70 points higher than the league average. Add to all of that his story about how, a few years ago, he wanted to give up on baseball and start a lawn-mowing business, and it seems like he may just make baseball relevant in KC again.