At the halfway point of the 2015-16 season, the Washington Capitals are the team to beat in the NHL, leading the league with a 32-7-3 record, while allowing a league-low 89 goals against. That's why it makes sense that Braden Holtby is considered the clear front-runner for the Vezina Trophy.
The Vezina Trophy, whose origins date back to the 1926-27 season, has been awarded since the 1981-82 season to the most outstanding goaltender, as selected by the NHL's general managers.