Chelsea's unbeaten run came to and end today with a 2-1 loss at Newcastle United.
Chelsea missed Nemanja Matic
The Serbian defensive midfielder was ruled out of the game through suspension, and whilst John Obi Mikel protected the back four fairly well in his place, he didn't offer as much as Matic.
Matic not only breaks play up better than Mikel, but is also a better and more aggressive passer of the ball, something Chelsea missed at times against Newcastle. Mikel proved that he can still play a role, but the drop-off from Matic was clear at times.
No invincibles season on the cards
Having gone 14 games unbeaten to start to the season, many people had - unsurprisingly - turned their attention to whether Chelsea could go the whole season unbeaten.
However, defeat at Newcastle means that an 'invincible' season is no longer available, leaving rivals Arsenal as the last club to go a season unbeaten. Chelsea need to react in their next game against Hull City, and kickstart another winning run.
Chelsea's problems at St. James' Park continue
Jose Mourinho's record at St. James' Park goes from bad to worse with yet another defeat up in the North East today. Last season, we saw Loic Remy - now a Chelsea player - score the winning goal for Newcastle against Chelsea, and today's win for Newcastle means Mourinho still hasn't won a Premier League game on Tyneside.
Chelsea's defence is far from impregnable
So far this season, Mourinho has stuck with a back five of goalkeeper Thibaut Courtois and defenders Branislav Ivanovic, Gary Cahill, John Terry and Cesar Azpilicueta - yet today, we saw that they can be opened up.
Cahill's error led to the first goal, and Azpilicueta was average before being substituted for Filipe Luis, who offered better balance on the left hand side. Chelsea were also outpaced for the second goal, and it just showed how teams can gameplan to beat the Blues.
Chelsea are still the team to beat
Despite this defeat, there's little doubting that Chelsea are still the favourites to win the Premier League title - regardless of their unbeaten run being broken.
Manchester City are putting pressure on Chelsea, but Mourinho won't give up top spot easily, and there's enough resilience and experience in this Blues side to bounce back.