Ottawa, which had won its previous two games, got its lone goal from Antoine Vermette. His score came after the Senators had fallen behind 3-0.
Boston needed only 28 seconds to produce its first goal, which came when Kessel grabbed the puck off a draw and fired a shot from the right circle.
The Bruins built a 3-0 lead after one period and beat the Senators for the second time in nine meetings.
Turkey considering to use pistachios to heat country’s first eco-city
Yosemite climber falls 30 feet, suffers major injuries