It was only 11 days ago that West Brom manager Sam Allardyce said he considered Arsenal a relegation rival.
But after a week which Arsenal boss Mikel Arteta described as "crucial," his side are now 12 points above the relegation zone and could be starting to look like European contenders once again.
When Allardyce took over at West Brom, the Gunners were in 15th place, four points off the bottom three with one victory in 10 Premier League games.
Now, following successive victories against Chelsea, Brighton and West Brom, they are six points off the top four and 11th in the table.