"I feel like our guys are doing a tremendous job," he said. "When you start to get these [close] plays, you have your naked eye. But sometimes there's plays that happen and I think I see it one way, and quickly the phone will ring and they'll go, 'No, he's safe.' Those guys have done a tremendous job of getting the information down to us, and I think it's worked pretty well so far."
When he challenged a play in the fifth inning Monday, Porter turned to face the dugout while talking to the umpire so he could get a signal from bench coach Dave Trembley, who had been on the phone with the person manning the replays, on whether to challenge.
"By the time I went out there and started talking to the umpires, I received a signal that we should challenge," Porter said. "Your eyes tell you what you think about it, but at the same time, because you have the advantage of technology, you kind of get confirmation once you get out there."
Porter said one of the trickiest things about the new system is the fact you have to decide within 10 seconds on a play that was the final out of the inning whether to challenge.
"They don't want the pitcher standing there for a long period of time if they end up overturning it," he said.
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.