Arsenal took a huge step towards securing Champions League football next season as they saw off an ill-disciplined Leeds United, with the 10-man visitors dropping into the Premier League relegation zone.
It was a fourth successive win for Mikel Arteta's side and one that puts them firmly in the driving seat for a top-four spot before Thursday's north London derby at Tottenham.
But Leeds' early capitulation was entirely of their own making, with goalkeeper Illan Meslier gifting the hosts an opener before captain Luke Ayling was sent off for a needless lunge on Gabriel Martinelli.
Eddie Nketiah pounced on Meslier's loose touch to open the scoring and then finished a swift move to double the Gunners' lead before Ayling's rash challenge left Leeds a man down for more than an hour.