article_snippet.sent: Right back Hector Bellerin gave Arsenal the lead as the Gunners went on to win 4-1 at the Emirates .
article_snippet.sent: Just four minutes later, Mesut Ozil had doubled the lead for the home side with this brilliant free kick .
article_snippet.sent: Alexis Sanchez got in on the goalscoring act just before half-time to give Arsenal an unassailable lead .