Basel's Marco Streller bagged the winning goal against Chelsea at Stamford Bridge.
The first week of the 2013-14 UEFA Champions League group stage gave us plenty to talk about.
From Chelsea's surprise loss at home to the domination from Barcelona and Real Madrid and everywhere in between, it was an opening week to remember.
Here is a look at how some of the biggest moments from the first week of European play looked through the medium of an infographic.
All infographics obtained from UEFA.com.
Bayern Munich got their title defense off on the right foot on Tuesday as they scored the first goal of the UEFA Champions League group stage.
Defender David Alaba unleashed a furious free kick in the third minute of the club's match against CSKA Moscow to put the German club ahead.
Bayern's campaign was kick-started by Alaba, with Mario Mandzukic and Arjen Robben joining him on the scoresheet for the 3-0 Group D victory at the Allianz Arena.
The two most impressive displays of the first group stage matches came from Spanish giants Barcelona and Real Madrid.
On Tuesday, Real Madrid destroyed Galatasaray, 6-1, while Barcelona unleashed a 4-0 thumping on Ajax on Wednesday.
Above is a comparison of where each player from both clubs was positioned for the majority of their time on the pitch. Real Madrid are on the right, and Barcelona are on the left.
During the final 16 minutes of the first half at the Stadio Sao Paolo in Naples, Borussia Dortmund's Matchday 1 fate was handed to them in a not so pleasant fashion.
After Gonzalo Higuain scored for hosts Napoli in the 29th minute, Dortmund manager Jurgen Klopp went ballistic, as seen in this wonderful GIF here.
Then, right before halftime, Dortmund keeper Roman Weidenfeller was shown a red card for handling the ball outside of his own penalty area.
Dortmund went on to lose the match, 2-1, and both Klopp and Weidenfeller will miss the club's Matchday 2 clash with Marseille on October 1.
By all means necessary, Barcelona defeated Ajax in the first competitive match between the two legendary clubs.
In their 4-0 victory at the Camp Nou, Barca dominated the action on the pitch.
The blue patches on this infographic represent where the Catalans were most active on the pitch.
As you can tell by the bigger blue dots, Barca were most active in front of the Ajax goal.
One of the most shocking results of the first batch of matches came from the Parkenstadion, as FC Copenhagen held Italian giants Juventus to a 1-1 draw.
Juve, represented here by the yellow dots, clearly had the best chances in the match but could not capitalize on most of their 13 attempts on goal made.
The draw was a setback in Group B for Juventus, who are down by two points early in the group stage to Real Madrid.
Willian made his highly anticipated Chelsea debut on Wednesday night at Stamford Bridge.
Much like the final result in West London, Willian's performance on the pitch was disappointing at best.
The two tiny blue dots on this infographic represent the major contributions that the former Shakhtar Donetsk and Anzhi Makhachkala midfielder had during the loss to FC Basel.
As you can tell, the 25-year-old left Chelsea fans wanting more when he left the pitch in the 67th minute.
Look away now, Chelsea fans.
This illustration shows the movement of the ball by the players of FC Basel on their first goal at Stamford Bridge, which was scored by Mohamed Salah.
In the build-up to the play, four of Salah's teammates touched the ball that would eventually lay in the back of Petr Cech's net.
Unfortunately for Chelsea, there was more to come later in the match as Marco Streller sealed their fate with an 81st-minute goal from a corner kick.
It took 64 minutes for Arsenal to score a goal against Marseille at the Stade Velodrome, and when they finally struck the back of the net, it was a Theo Walcott volley that did the job.
Before Walcott was able to thrive off a poor clearance by a Marseille defender, his teammates created a strong build-up to the goal.
That build-up included a crucial cross from Kieran Gibbs that caused a bit of trouble to the Marseille back line.
Per Mertesacker, Laurent Koscielny and Jack Wilshere were also involved in the build-up to the goal.
For the first half of their trip to the Czech Republic on Tuesday, Manchester City could not find the back of the net.
With no goals in the first half came noise from critics of the club that they were doomed to fail in Europe once again.
However, City responded with three goals in quick succession to bury Victoria Plzen.
The three soccer balls grouped together represent the goals scored by Edin Dzeko, Yaya Toure and Sergio Aguero in a 10-minute span.
This infographic displays how much attacking momentum that Atletico Madrid had during their Wednesday Group G clash with Zenit St. Petersburg.
Atletico were on the offensive from the outset, and they were finally rewarded in the 40th minute with a goal from Joao Miranda.
The very few light blue valleys shown in the infographic represent the few times in the match that Zenit could get some positive momentum going.
All of the Zenit momentum was killed for good when Arda Turan put the Spanish side ahead in the 63rd minute.