Alexandre Lacazette has become the first Arsenal player to score in his opening three league appearances at home since Brian Marwood in September 1988.
This French professional footballer who has scored in each of those home wins did throw in to an open net in the 20th minute after West Brom goalkeeper Ben Foster tipped Alexis Sanchez’s free-kick onto the crossbar.
However West Brom thought that they should have been awarded a penalty when Shkodran Mustafi brought down Jay Rodriguez with a sliding challenge. But then no such foul was awarded by referee Bobby Madley.
Right after the break, Arsenal were awarded a spot kick when Allan Nyom barged over Aaron Ramsey close to the byeline.
Then it was Lacazette who calmly stepped up and made his fourth goal since his club record £46.5m summer move from Lyon.
Victory for the Gunners lifts them to seventh in the table, one point behind fourth-placed Tottenham and six behind leaders Manchester City.
West Brom – on the night midfielder Gareth Barry broke the Premier League appearance record – drop to 12th.
Arsenal truly deserved the win since the two goals from Lacazette earned them a 2-0 over West Brom but there were certain difficulties in the first half of the game. Anyways the two goals for Lacazette brings Premier League graph to four from five starts. His eye for goal is obvious and Arsenal have lacked a sharp penalty-box poacher for many years. At the back Monreal was superb throughout, and the second-half performance was one which fully merited the win.