Guimarães and Saka fire Arsenal to win at Sunderland after Raya spot-kick save

<p>As the final whistle blew Bruno Guimãraes wore a mischievous smile, Enzo Le Fée was a study in dejection and Arsenal’s immaculate start to the season remained unblemished.</p><p>Two minutes after David Raya had, rather majestically, saved Le Fée’s second half penalty, Guimãraes