Senators 3, Maple Leafs 2: Colin Greening scored with 23 seconds remaining in the third period to lift host Ottawa to its fourth win in a row.Greening went to the net off the faceoff and batted a rebound around Toronto goaltender Ben Scrivens for his third goal of the season. Rookie Mika Zibanejad and Erik Condra also scored for the Senators while Ben Bishop made 26 saves.Mikhail Grabovski opened the scoring and Clarke MacArthur tied the game during a third-period power play for the Maple Leafs, who defeated Ottawa 3-0 at home on Feb. 16. Scrivens stopped 32 shots.Greening helped set up Zibanejad's goal in the first period and was credited with another assist when Condra scored late in the second by driving to the net and having the puck deflect off his body as he and Toronto defenseman Korbinian Holzer crashed into Scrivens.After Senators rookie Eric Gryba took a hooking penalty 5:33 into the third period, MacArthur knotted the contest by backhanding the rebound of defenseman Mike Kostka's point shot the puck through a crowd in front of Bishop.GAME NOTEBOOK: Greening and Scrivens were teammates at Cornell University, and both received Quill and Dagger honors in the same year. … MacArthur has four points in his last four games. … Maple Leafs D John-Michael Liles was a healthy scratch for the fourth straight game.