West Bromwich Albion have scored just before halftime to take a 1-0 lead over Arsenal at the Hawthornes.
Following a failed corner, Claudio Yacob headed home a pinpoint cross from Morgan Amalfitano to give the home side the lead.
Arsenal have opened the scoring in each of their first six Premier League matches.
The Baggies suddenly have taken command of a game that has provided little else for fans in the first half.
All of a sudden, the Gunners have a lot of work to do to return their chance at going top of the table. They could do so with a win or draw.