RSL improved to 13-7-3 with its third straight home victory to move within a point of Western Conference rival San Jose for the best record in the league.
Saborio scored his first goal on a penalty kick, after Jay DeMerit fouled Kyle Beckerman in the box in the 32nd minute.
Then, after Darren Mattocks leveled the match for Vancouver with a goal in the 52nd minute, Saborio struck again with a header off of a beautiful pass from Javier Morales.
Saborio now has a team-high 13 goals on the season.
RSL next plays Herediano of Costa Rica in a CONCACAF game July 31st.