Nathan Horton assisted on both of Krejci's scores and added an insurance goal in the third period, and Tuukka Rask stopped 29 shots for the Bruins, who silenced Sidney Crosby and the rest of the NHL's top-scoring team.
Zaheer Khan clubbed Nathan Bracken and slog-swept Hogg for massive maximums but the 41 runs he added with RP Singh at the end were nothing more than a mild nuisance for the world champions.
Nathan Dyer's header from Pratley's free kick broke the deadlock on seven minutes before Pratley himself added a second six minutes later with a volley.