By Sean Walsh Arsenal kept pace with their Premier League title rivals with a thumping 4-1 win at home to Newcastle United on Saturday night. The Gunners had a point to prove after their surprise 1-0 defeat to Porto in the first leg of their Champions League last 16 tie on Wednesday, and they silenced their doubters with a fine performance back on home soil. The Magpies were second-best from the off and deserved to leave the Emirates Stadium without any points. How the game unfoldedNewcastle were pinned in early doors, with Arsenal winning the ball high up the pitch on numerous occasions. Buka…