Arsenal maintained their 100 per cent record in dramatic fashion as they defeated a spirited Sunderland side 2-0 at the Stadium of Light. In two-and-a-half pivotal minutes David Raya saved an Enzo Le Fee penalty and Bruno Guimaraes scored a superb first goal for the club. Bukayo Saka added a stoppage time penalty to add gloss to the win.The first half was a closely contested affair with clear chances at a premium. Kai Havertz went closest, first when he took the ball on his chest and volleyed brilliantly toward goal only to be denied by a smart Robin Roefs save, then when Granit Xhaka improvised a back-heel clearance to prevent him nodding in from close range.Sunderland came out in the second half with a real sense of purpose and 10 minutes in had a penalty. Referee John Brooks had spent much of the game dealing with both teams seeking advantage at set pieces and decided Ezri Konsa had crossed the line when grappling with Dan Ballard. Enzo Le Fee stepped up but was denied by a brilliant save from David Raya, plunging to his left and palming the ball onto the base of the post.Within a blink of an eye, well, two-and-a-half minutes, Arsenal were ahead. Bruno Guimaraes, on as a half-time substitute, received the ball from Declan Rice outside the box and struck a superb shot into the top corner.In a pulsating game, Sunderland could have equalised when Nordi Mukiele’s back-heel was blocked before Arsenal thought they’d extended the lead when Jurrien Timber, making his first appearance of the season as a substitute for the injured Ben White, head in a Martin Odegaard free-kick, only for it to be ruled offside.Mukiele forced another brilliant save from Raya in the closing moments as the champions were hanging on.Saka converts a late penalty (Stu Forster/Getty Images)Then, in stoppage time, Reinildo conceded a penalty for a foul on Bukayo Saka, and was shown a second yellow card and sent off.Here Art de Roche, Ahmed Walid and Michael Walker dissect the key talking points.How important were those two-and-half minutes to the title race?That is all the time that was between David Raya’s latest divine intervention for Arsenal and Bruno Guimaraes’ first to maintain their 100 per cent start to their Premier League title defence.Raya may not be the busiest goalkeeper in the league, but every week it seems his focus makes the difference for Arsenal. His late save against an Estavao curler secured Arsenal’s 2-1 win over Chelsea on matchday three, while this save set them up to go ahead in the north east.