Alexandre Lacazette scored twice to earn a shaky Arsenal victory over West Brom, their third Premier League win in a row at Emirates Stadium.
The France striker – who has scored in each of those home wins – headed into an open net in the 20th minute after West Brom goalkeeper Ben Foster tipped Alexis Sanchez’s free-kick onto the crossbar.
West Brom, on the night midfielder Gareth Barry broke the Premier League appearance record, felt they should have been awarded a penalty before the opener when Shkodran Mustafi brought down Jay Rodriguez with a sliding challenge.
Instead of staying on the ground following the contact, Rodriguez chose to continue but his shot was tipped onto the post by a diving Petr Cech.
After the break, Arsenal were themselves rightly awarded a spot-kick when Allan Nyom barged over Aaron Ramsey close to the byeline.
Lacazette stepped up and calmly slotted into the bottom right corner – his fourth goal since his club record £46.5m summer move from Lyon.
The Baggies caused Arsenal problems in the first half in particular, with Nacho Monreal brilliantly clearing a Rodriguez header off the line in the 38th minute.
Victory for the Gunners lifts them to seventh in the table, one point behind fourth-placed Tottenham and six behind leaders Manchester City while West Brom drop to 12th.