Arsenal came into this game with four wins from their previous four matches in which they had not conceded a goal.
But on Sunday the Gunners did not start like a team who were top of the league and in such good form.
It took until about the 30 minute mark for them to have a shot on target through Leandro Trossard and there had been some shaky moments at the back as loose passes and Mateta caused trouble during the first half.
Arsenal have been known for their threat from set-pieces for a while and it was another excellent Rice free-kick that led to the opener and, ultimately, the match winner.
The goal meant the Gunners have now scored 11 goals from set-pieces in the Premier League this season, two more than any other side.
Mikel Arteta has spoken repeatedly about why set-pieces and defending are important. In games like this against teams who pose a threat, being able to win when not playing at their best means Arsenal can keep grinding out the important points as they look to win the Premier League title.
