Duffy allowed only two walks and three hits in the stellar performane, which brings the 28-year-old to 3-3 through nine starts in 2017.
Fantasy Impact Walks are an issue for Montgomery in his young Major League Baseball career, as he has walked multiple batters in six of his seven starts, and now he has allowed a home run in back-to-back starts.
OUR PREDICTION: The Yankees are a ideal 4-0 in their last four games in Kansas City and 75-34 in their last 109 meetings with the Royals.
"Danny was just on the attack all night", Royals manager Ned Yost said.
Starlin Castro had three hits and drove in a run.
Merrifield got things started in the fifth by pushing a bunt single past starter Jordan Montgomery.
It would be tough to choose my favorite inning from Duffy. Michael Pineda started for the Yankees and quickly got the job done when he was able to get the defensive side of the Yankees up to 6-0 before allowing a two-run homer by Salvador Perez, making it 6-2 in the 4th inning. "On certain nights it's going to be tough to put a lot up against them", Yankees manager Joe Girardi said. I know the fans expect more from me and I expect more from myself.
When third baseman Chase Headley fielded Jorge Soler's grounder on a big hop, an easy double play was in order. The misplay ended up costing the Yankees a pair of runs, as Whit Merrifield and Drew Butera delivered back-to-back RBI singles with two outs in the frame. If you're healthy, keep grinding it out, don't give away at-bats, I think it's going to be good, " said Castro, concentrating more on driving the ball to center and right and being more patient at the plate.
Holliday and Judge promptly got their base hits in the sixth.
Vargas had given up one earned run over 26 2/3 innings in his first four starts at Kauffman Stadium, a microscopic 0.36 ERA. NY had scored at least seven runs in each of its last four games.
Because at some point Thursday afternoon, Duffy looked at the standings, noticed the KC Royals were at the bottom of the AL Central and had lost their first two against the Yankees and decided he was throwing the team on his back in the finale.
On Thursday night, A-Rod was in the broadcast booth for Fox Sports, doing his first color analyst spot, with play-by-play man Kevin Burkhardt.
"Hicks has played really, really well", Girardi said. The Yankees open a series Friday in Tampa Bay with RHP Luis Severino set to start.