Aaron Ramsdale produced a fantastic save to deny Crystal Palace an early lead during their encounter today .
Watch: Tierney comes on as a sub and provides an assist for Bukayo Saka who scores to make it 4-1
The Gunners thrashed Palace 4-1 with goals coming from Martinelli, Saka and Xhaka.
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Palace had chances early on in the first half and could have punished Arsenal.
Watch: Gabriel Martinelli scores his 13th league goal from an extremely tight angle to give Arsenal the lead
Nonetheless the Gunners are 8 points clear of Manchester City following the win.