3 things you need to know about Wednesday's Champions League action

The second matchday of the Champions League came to a close on Wednesday as 16 teams competed in eight fixtures across Europe. Atletico Madrid did what no other club has been able to do this season and scored against Juventus, Liverpool's domestic woes extended to the realm of European football as they visited Basel, and it was raining flares at the Emirates Stadium as Arsenal's Danny Welbeck silenced the haters by registering a hat-trick versus Galatasaray.

theScore's Carlo Campo and Gordon Brunt run down three things you need to know from Wednesday's Champions League action.

Juventus' unbeaten run ends as Atletico Madrid earn 3 points at the Vicente Calderon

Carlo Campo: In a fixture between the reigning La Liga champions and reigning Serie A champions, a 74th-minute goal from Arda Turan proved to be the difference as Atletico Madrid prevailed 1-0 over Juventus.

The match marked Atleti's first home fixture in the Champions League since they reached last season's final, and unsurprisingly, the atmosphere inside the Vicente Calderon was sublime from kickoff until the final whistle.

While Turan's goal was the first that Juventus have conceded in the seven matches they've played so far this season and the first they've allowed in 1,055 minutes of action, it came as something of a surprise when you consider that Atleti only managed two shots on target and were rarely in possession of the ball.

Of course, two shots on target were two more than Juventus registered in the match.

Also, needless to say, Diego Simeone was pleased with the final result.

Gordon Brunt: Is there any wonder why fans love manager Diego Simeone?

Whether he's encouraging an already insanely loud Vicente Calderon crowd to make even more noise:

Or needlessly kicking the ball down the pitch:

The love affair between Simeone and Atletico Madrid supporters is unmatched.

His passion seemingly carries over to his player on the field as their relentless fight saw Atletico Madrid come away with an important three points against their toughest opponents in Group A, Juventus.

It was Arda Turan's finish late in the game that ensured this battle of Spanish and Italian champions would end with a victor.

Liverpool's misery continues after falling to Basel

CC: Liverpool had the chance to put their Premier League struggles aside on Wednesday against Basel, but Brendan Rodgers' side struggled to get things going offensively and fell 1-0 at St. Jakob-Park.

The match's lone goal came in the 52nd minute courtesy of Marco Streller, and assuming Real Madrid continue to breeze through the group stage, it could be a costly goal for Liverpool, as they'll likely compete with Basel for the group's runner-up spot.

It's also worth noting that Basel have a phenomenal history against English clubs, as they've now won each of their last four Champions League matches against Premier League teams. They defeated Chelsea both at home and away in last season's group stage and eliminated Manchester United from the competition in 2011.

Oh, and back in 2002, Basel knocked Liverpool out of the Champions League after holding them to a thrilling 3-3 draw.

Of course, picking up three points against Liverpool isn't too tough when Mario Balotelli is playing so deep that he's no longer a scoring threat.

GB: It's beginning to look like domestic league and Champions League matches are catching up with Liverpool. They've been unable to find the consistency needed to simultaneously compete at the highest level in both competitions.

It was always going to be a difficult adjustment for the Merseyside club, who haven't appeared in the Champions League since 2009, but their loss Wednesday to Swiss club Basel revealed a club that lacks proper depth. 

They also showed signs of fatigue as players such as Raheem Sterling looked like the gruelling schedule of the Premier League, coupled with mid-week Champions League fixtures, is catching up to him as his recent play displayed signs of a player exhausted both mentally and physically.

Liverpool narrowly came away from their opening match against newcomer Ludogorets with a 2-1 win and looked as though they regressed since then as their performance Wednesday showed a real lack of killer instinct, with Mario Balotelli suffering yet another poor performance.

Captain Steven Gerrard summed it up best:

All signs are pointing to a drubbing when Liverpool host defending champions Real Madrid on Oct. 22.

Danny Welbeck's hat-trick guides Arsenal to win over Galatasaray

CC: Becoming the sixth Englishman ever to score a hat-trick in the Champions League isn't a bad way to silence your critics.

Led by a three-goal performance from Danny Welbeck and some excellent midfield play from Mesut Ozil, Alexis Sanchez, Alex Oxlade-Chamberlain, and Santi Cazorla, Arsenal cruised to a 4-1 over Galatasaray to earn their first Champions League points.

It was an offensive performance to behold unless you were standing among the Galatasaray supporters, who proceeded to interrupt the match by launching flares and burning garbage onto the pitch after their side went down 2-0 within the opening 30 minutes.

But to end things on a positive note, a shout-out to David Ospina, who was forced to enter the match in the 62nd minute after Wojciech Szczesny received a questionable red card for a challenge on Burak Yilmaz. The Colombian 'keeper went on to make a number of impressive saves, none of which were better than this beautiful diving stop on Yilmaz towards the end of the match.

[Courtesy: @Arsenalist]

GB: Wednesday's Group D encounter between Arsenal and Galatasaray had it all: goals, diving saves and fire.

It was always going to be an electric atmosphere inside the Emirates Stadium, with most of the noise coming from the away supporters as the Turkish fans belted out tune-after-tune in support of their club.

That festive atmosphere, however, changed when Galatasaray went down 2-0 and fiery objects were tossed onto the pitch.

And it was all thanks to Danny Welbeck.

Welbeck made his arrival from Manchester United complete when he notched his first ever hat-trick at the senior level and had fans singing his praises when his third goal gave Arsenal a resounding 4-0 advantage.

The three-goal performance in the Champions League was so rare at the club that Welbeck became just the third player in the team's history to do so, joining a club legend (Thierry Henry) and a flop.

Welbeck's display even had injured midfielder Aaron Ramsey excited to see what the English international would do in the team's next match.