Against Fulham last weekend he was not very effective, squandering a couple of glorious chances to open his Premier League account for the season. That being said, as long as he is on the pitch, he can pose a real threat to any side. Hazard has created more chances than any other Chelsea player this season, although he is yet to record a goal or assist in the league.
Hazard is also Chelsea's top dribbler this season, with 2.8 dribbles per game. It is clear that whichever full-back he'll be up against (likely Kyle Walker) he will cause them problems and look to attack them both on the inside and the outside. This will have ramifications for Spurs' defensive midfielders too, as when he drifts infield the midfielders might have to take over from the full-back and look to marshal Hazard.
The above graphic from the 1-0 loss at Everton highlights how his movement can be problematic for opposition players. While he is stationed from the left he spends a lot of time coming inside, as well as switching flank. Furthermore, his desire to continuously beat his man means that he consistently commits the opposition and this may effect Walker's ability to bomb-on forward.
Walker is a very good full-back in the sense that he is quick and aggressive getting forward, but he can at times leave gaps in behind. While Walker has improved defensively, he is still not the most assured and last season he struggled in this fixture against Juan Mata.
Furthermore, looking at Walker's heat map (above), it's clear he really works his right-flank, but with Mourinho looking for Chelsea to counter very quickly with transitions, perhaps Walker could be a potential weak point.
This is because Walker plays an big role in Spurs' attacking build up. The right-back looks to play as almost as a right-midfielder in attacking moves, thus allowing Tottenham's right-winger to cut inside and be an extra central playmaker.
Furthermore, looking at Walker's passes against Norwich, it is clear that he makes a majority of his passes in the opposition half. Perhaps the problem with this, against a team like Chelsea, is that it means there is space to exploit in behind the right-back, meaning Hazard, a player very comfortable running with the ball and creating, could exploit the space.
Hazard against Walker will be one of the most interesting duels in the Spurs v Chelsea game. This is because both players share the same desire, in the sense that they want to attack at every given opportunity.
Furthermore, because of Mourinho's counter-attacking style and his desire to exploit teams in the transition phases, this means that Walker, Spurs' most prolific passer (240 accurate passes this season), has two options.
These are: (a) Walker minimises his natural forward runs, which means Spurs will lack width on the right-hand side; or (b) Walker continues to offer width down the right-hand side, but he will have to be at the top of his game, or the space left behind him could be exploited by the pacey, dynamic Hazard.