Zack Greinke threw for all of 10 minutes in his first bullpen of spring training, and those throws provided plenty of positive vibes for everybody involved with Arizona watching the ace pitcher.

After an extensive warmup and stretching routine and some long toss in the outfield, the Diamondbacks' new $206.5 million man tossed to catcher Welington Castillo on Friday under cloudy skies that provided cool, comfortable workout conditions.

"Very nice," Castillo said on several pitches. Greinke didn't say much aside from regularly shaking his head.

Hall of Famer Randy Johnson took in Greinke's session from about 15 feet away along the back fence, while Arizona chief baseball officer Tony La Russa observed from a corner of the bullpen seated in a golf cart. Manager Chip Hale, hands tucked into this waistband, viewed Greinke from another corner.

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