Royals manager Ned Yost said he has no doubt Duplissea is the best in the game.
"I think it starts with the communication we all have," Yost said. "It's the trust he has to do his job. He has the freedom to be daring and make the right call. He was the best in the business last year.
"It's a relatively new job, but he took to it right away."
When a close call is made on the field, bench coach Don Wakamatsu immediately picks up the dugout phone and calls Duplissea in the video room. Yost then waits for a thumbs up or down from Wakamatsu.
"With the new rules, it's a little more hectic because you got only 30 seconds," Yost said. "There are times that the 30 seconds feels like an hour. I'll be going, 'You got 10 seconds. You got seven seconds.' But he gets it right."