Juninho gave the Galaxy all the scoring they would need with a sizzling strike from 28 yards out in the 41st minute -- the Brazilian's sixth tally in five games.
Beckham logged an insurance goal with a trademark free kick score as Los Angeles (13-11-4) won for the 10th time in 15 MLS games and pulled into a tie with Seattle for second place in the Western Conference.
The Whitecaps (10-11-7), meanwhile, dropped their fourth straight.
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