The Galaxy (18-3-10) trailed 1-0 when they began a second-half comeback, sparked by Chad Barrett's tally in the 59th.
Thirteen minutes later, Los Angeles defender Todd Dunivant put a ball to the front of the net where Borchers deflected it into his own net and the Galaxy hung on for their fourth straight win.
Fabian Espindola had put RSL (15-10-6) in front in the 45th minute.
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