PITTSBURGH — Mike Sullivan returned to Pittsburgh on Saturday for the first time since he and the Penguins organization parted ways last April, but the new Rangers coach had bigger problems than trying to keep a straight face when the Penguins played his tribute video on the PPG Paints Arena scoreboard.

Sullivan was trying to figure out a way to beat his former team without having the services of Vincent Trocheck, who the Rangers said will be out on a week-to-week basis with an upper-body injury. Special teams ended up being the key for the Blueshirts.

Adam Fox had two goals and an assist, and the Rangers scored twice on the power play and once shorthanded to give them a 6-1 victory and a sweep of their two-game road trip that started Thursday in Buffalo.

“Special teams was good,’’ Fox

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