A single lapse of concentration cost Tottenham dearly in their 1-0 defeat to Arsenal during Sunday’s North London derby. Ange Postecoglou‘s side dominated the ball and committed numbers forward from the first whistle, but they were unable to find a way past Arsenal‘s resolute defence. William Saliba and Gabriel shone for the visitors, with Arsenal’s defensive duo putting on a masterful performance in both boxes. They were able to keep Tottenham’s £65m club-record signing Dominic Solanke quiet at the back, while Gabriel broke the deadlock with a towering header in the second half. The Brazilian…