If you only look at the form on paper and pretend league games are the only thing in the world, fine, but they've looked much better recently. They were done by the referee vs. Watford, comfortably won their CL game and played their way into form against Stoke.
They've worked out Dier+Vertonghen is the pair to use without Vertonghen and they looked much more solid then when trying to shoehorn Sanchez in, and Dembele coming back into midfield has made them a lot more stable, now he can play a full game.
Spurs are on their way back up from their dip in form, that doesn't mean they'll beat us, but even if we win I think they'll be comfortably back in the race for 2nd by Christmas.