The Ottawa captain scored three goals in his second game after missing 11 with a shoulder injury, and the Senators drove a tired Tim Thomas from the net midway through the second period of their 5-1 win Monday.
"Being able to do some real good workouts and skates, coming back I feel fresher than anybody," Alfredsson said.
He ended his layoff on Saturday with a goal and two assists in a 4-2 win over Montreal. That day, the Bruins ended a three-game West Coast trip in Los Angeles with Thomas in goal. After the cross-country flight home, Thomas played his third game in five days Monday and was removed when Alfredsson's second goal made it 3-0.