The Chile forward picked up a pass inside the box from Mesut Ozil and left both Maya Yoshida and Jack Stephens on the ground as he cut back inside and finished well.
You know that new-term coined in this depressing modern era of football known as "the race for fourth"?
"That's Alexis, he's a player who never gives up", said Wenger. Alexis never gives up and once he has the ball in the box he is always unsafe. It was a very convincing win.
"Alexis always grows during the game". We'll need another strong performance at Stoke.
"It was tough in the first half but then we found the opening goal and settled into the game".
Alexis Sanchez and Olivier Giroud scored the goals as the Gunners closed-in on top-four rivals Manchester City and Liverpool.
The result means eighth is all-but out the Saints' grasp unless they can better West Brom's results in two of the last three games.More news: Trump pays tribute to fallen police officers
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Wenger's decision to start Danny Welbeck for the second successive game suggests he has now edged ahead of Giroud in the pecking order, particularly with the FA Cup Final in mind. They were certainly not playing like a team that had to win the match to keep their faint top-four hopes alive.
"I'm always harsh with the one that doesn't play". "We went through a bad patch". "It's a good opportunity to show your character, how you come back and how you recover from that... but let's not jump too quickly to conclusions and, instead, focus and give everything at Stoke on Saturday". We just like to upset teams that maybe sometimes expect to win.
'We still feel we could finish eighth, but we know everything has to go for us, ' Hughes added.
"We came to a hard ground today and we go to another on Saturday". Everybody played well, so let's just continue.
It was a professional display from there on in from Arsenal, who recorded a first league win at Southampton since their unbeaten title-winning season of 2003/04. They're three points adrift of Man City and four off Liverpool but the game in hand they have over the Reds is against Sunderland, so Wenger will fancy saving face and nicking that fourth spot.
Arsenal are looking to win their remaining three matches in order to boost their hopes of achieving a place in the Champions League next season.
Arsenal manager Arsene Wenger feels that teams battling in Europe and domestically will find it hard to win the coveted English Premier League (EPL) title.