Trailing by a pair of goals entering the final frame, the Caps exploded for four straight scores, ignited when Ovechkin scored unassisted 4:23 into the period.
Alex Semin netted the equalizer 2 1/2 minutes later and Dennis Wideman's goal only 28 seconds after that gave the Caps their first lead.
Ovechkin -- who has scored seven times in eight games -- finished the barrage with a power-play goal at 11:03 and Washington won for the fifth time in those eight contests.
Tomas Vokoun turned aside 35-of-37 shots for the victory.
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