Just read a thread on a GW2 forum where someone posted a video of the other team capping points before the match starts in sPvP Tournaments (Might work on regular too maybe)
and another person posted this in the thread :
"i know this, you dodge right before the game begins, you spawn in the place you were before the match began.
i haven't tried it personally but i've heard people speak about it and seen players roll then get that point right of the bat. "
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After a match, if you dodge roll just right before the other match begins, you will spawn at the same spot you were on the map in last match, and will be able to cap points
here's the video of the other team exploiting this, it was filmed by the guy who posted the exploit thread