Your chances might be better, but that's purely hypothetical because agents generally won't represent you for that. Here's why: because agents get paid as a cut of what you get paid--and the overwhelming majority of magazines pay zilch, or near-zilch, for short stories. Even the New Yorker, Harper's, etc., pay somewhere in the $1000-$5000 range, which just isn't enough to get an agent involved--what, they should send your stories out for the possibility of eventually netting somewhere in the neighborhood of $100-$700?!
They'll do it if they're also representing you for a novel or a short story collection, and if you have an agent I suppose you could mention it in your cover letter ("Dear Actual Name of Real Editor: My agent, Binky Urban,* thought you might like the enclosed story..."), but generally speaking, when it comes to submitting short stories to magazines you're on your own.
* Pipe dream