"I think it went well; it was our first game," Pageau told the Senators' website. "The pace was pretty high but I think our team stayed in the game plan, worked pretty hard, and good things happen when you work hard."
Pageau scored a hat trick in Game 3 of a first-round series against the Montreal Canadiens last season.
"I think [I have] a little bit more experience," Pageau said. "I just try to lead the way here on the ice and I hope that my leadership helped the other players."
Cody Sylvester scored a power-play goal for Pittsburgh.
Rielly, a defenseman who was the fifth pick of the 2012 NHL Draft, created several scoring chances for the Maple Leafs, according to a CBC report.
"He was as advertised," Toronto Marlies coach Steve Spott told CBC.ca. "I put him in a tough spot in the shootout, but certain players want to be in those situations and Morgan is one of those guys."
"It was more a precautionary thing to take him out of the game," Spott said. "If it was a regular-season game he would have been fine."