Legwand's score off an assist from Francis Bouillon capped a Nashville comeback that saw the Predators erase a 3-1 third-period deficit.
Partic Hornqvist got the comeback rolling 2:57 into the frame when he tucked in the rebound of a Shea Webber shot.
Pekka Rinne improved to 2-0 since signing a seven-year, $49 million contract Thursday, turning aside 35-of-38 shots to earn the win.
Antti Niemi stopped 31 shots in the setback.
Boston schools pull out free condoms over wrapping complaints
Millions of Getty images now available for free via embed tool