First-base umpire Gabe Morales ruled Blanco safe, and Miley immediately motioned to manager Kirk Gibson in the dugout to come out and challenge the play.
After a brief review, it was ruled that Miley had in fact tagged Blanco before they both touched the base, so the call was overturned and Blanco was out.
"I just saw he was right there and I knew I could tag him, so I just tagged him," Miley said. "I knew it was going to be close if I just went to the bag and I was pretty sure I got him, and I was kind of shocked when they called him safe."
It proved to be a key play as Miley was able to retire the next batter and end the inning with Arizona still up, 2-0.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.