The play in question was Adeiny Hechavarria's two-out hit to center off Atlanta reliever David Hale.
Jarrod Saltalamacchia scored from second on the play, and Casey McGehee went from first to third. Aggressively running the bases, Hechavarria went straight to second. B.J. Upton's throw to second was fielded by Dan Uggla, who applied the tag. Second-base umpire Jim Reynolds signaled out.
Saltalamacchia scored before the tag was applied. However, on the close play, the Marlins believed Hechavarria was safe.
So Redmond, in a lopsided game, asked for a challenge. After a short review, the call was overturned, and Hechavarria was credited with an RBI double.
"It's the fifth inning," Redmond said. "We're still playing. Guys, they're still running balls out and playing hard. We're playing the game the right way. Hech busted it out of the box. That, for me, is the key. That's why we have replay, to get the calls right.
"We're in the fifth inning going up against one of the best teams in baseball, one of the best offenses in baseball. I think the key is we're going out there and we're playing hard. That's why we have replay, to get the calls right. And the call was wrong."
Hale got out of the inning when Nathan Eovaldi grounded out to short for the third out.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter @JoeFrisaro. This story was not subject to the approval of Major League Baseball or its clubs.