The biggest reason has been Mauricio Pochettino's ability to utilise his squad and counter opposition styles with innovative tactics.
A recent shape the Argentine has successfully deployed is the use of a diamond midfield.
It has led to outstanding results and performances, including the 1-1 draw away to Barcelona and 3-1 home win against Chelsea.
In fact, only Arsenal and the tactical brilliance of Unai Emery has bested Pochettino's diamond in recent months.
The diamond has been a defensive tool as much as an attacking one.
The 'number ten' has often been deployed to sit on the opposition's deepest midfielder - Jorginho at Chelsea, Busquets in the second half against Barcelona - to stop them playing out.
It has worked a treat, with Spurs either recovering the ball high up, or forcing the opposition to play low percentage passes.
Once recovering the ball, Tottenham then have a four-man midfield, meaning they outnumber the opposition.
Both things led to Spurs having more possession than Barcelona at the Camp Nou, a feat which has been achieved by only two other teams since 2008; Real Madrid in 2008 and Rayo Vallecano in 2013.
However, one weakness of the diamond is the lack of width.
Tottenham have countered this by aggressively pushing their full-backs high or, failing that, having one of the strikers pull wider to stretch the opposition.
Defensively, the likes of Moussa Sissoko and Eric Dier have used their energy and responsibility to quickly cover the sides of the pitch, offering protection on the wings.
Overall, Pochettino's brilliance has seen Spurs perform against the odds, and the diamond has been a major reason for that.
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