Arsenal move five points clear of Manchester City at the top of the Premier League table.
The Gunners were hindered by Everton for the first 40 minutes but Bukayo Saka’s brilliantly-taken opener induced the floodgates to open as Mikel Arteta’s side capitalised on their game in hand in ruthless style.
Bukayo Saka cracked the stalemate five minutes before half-time with his 10th goal of the season before Martinelli added a second in stoppage-time.
Martin Odegaard made it three after the restart and Martinelli completed the flight, as the Gunners turned on the style in front of their jubilant supporters, Eurosport reports.
The persuading win gives Mikel Arteta’s side some breathing space as they chase down their first league title since 2003/04.
The victory means, with 13 matches left, Arsenal has 60 points, five more than second-placed Man City with the same number of matches played.
Everton, meanwhile, remain mired in relegation trouble in 18th place.