Leaders Arsenal put on a masterclass to overwhelm shell-shocked north London rivals Tottenham Hotspur 2-0 away and extend the gap at the top of the Premier League to eight points on Sunday.The Gunners flew out of the blocks from the opening whistle and built a first-half lead through a clumsy own goal by Spurs keeper Hugo Lloris and a sublime strike from Martin Odegaard.Tottenham were totally outplayed by a fired-up Arsenal side under Mikel Arteta who were determined to make amends for a loss at Spurs last season that ultimately cost them a top-four place.They dominated the first half and battled gamely in the second, leaving Tottenham boss Antonio Conte looking glum on the sidelines as he clapped his hands to rally his sorry side.Striker Harry Kane, needing one more goal to equal Jimmy Greaves all-time Spurs' scoring record, had chances either side of the break but keeper Aaron Ramsdale was equal to them.The win puts Arsenal on 47 points from 18 games ahead of Manchester City on 39, with Newcastle United, who have played a game more, and Manchester United a further point back.Spurs are in fifth place with 33 points from 19 matches.FULL MATCH DETAILSArsenal had the first clear chance after seven minutes when Eddie Nketiah's shot was well saved by the diving Lloris.They took the lead seven minutes later when Bukayo Saka crossed from the right and Lloris fumbled the ball into his own net for the first time in his 354-game Premier League career.Arsenal were in almost total control and Odegaard nearly put the visitors further ahead with a rasping long-range drive that Frenchman Lloris tipped round the post.Thomas Partey then came even closer with a fierce volley from just outside the area that crashed against the post.But