As of Tuesday afternoon, London Breed is still leading the mayor's race with 50.42 percent of the vote, and Mark Leno has 49.58 percent. That's a difference of just 1,861 votes.
She was ahead by 1,601 votes on Monday.
YOUR VOICE, YOUR VOTE: Bay Area June 2018 Election Day results
There are an estimated 8,000 votes left to count, which means that workers could possibly be done counting by as early as Wednesday.
Observers from the mayoral campaigns of Mark Leno and London Breed remain on site, scrutinizing the process. According to Elections Director John Arntz, the ranked choice voting system is not making the process slower than usual, though RCV dubbed instant runoff is anything but. Arntz says "this is really how elections happen, this is the process. San Francisco is really no different from other counties in the state."
San Francisco voters approved the method back in 2002, where they rank their top three picks. It allows like-minded candidates to team up. That's what Mark Leno and Jane Kim did in this mayoral race against London Breed and that's what happened to Oakland Mayoral candidate Don Perata in 2010.
The perceived frontrunner was beaten by Jean Quan after she and a rival joined forces against him. Perata's political consultant, Larry Tramutola, believes ranked choice voting is too confusing and allows insiders to manipulate the system. "I bet if you asked 100 people on the streets, there's not five of them who could tell you how ranked choice voting works, and that's a problem."
VIDEO: Here's how ranked-choice voting works
But ranked choice supporter Pedro Hernandez with an organization called FairVote California says voters made more mistakes voting for governor than San Francisco mayor and he believes ranked choice has diversified politics.
"We also see more women and people of color getting elected into office with ranked choice voting across the four Bay Area cities that use it. "
The other Bay Area cities are San Leandro, Berkeley, and Oakland.
Get all the latest Election Day 2018 stories and videos from ABC7 here.