Manchester City began their Premier League campaign with a slick 3-0 victory at West Bromwich Albion on Monday, with Yaya Toure’s brace providing a timely reminder of his enduring class.The Ivorian, linked with a move away from the Etihad in the close season after some inconsistent displays, gave the former champions a ninth minute lead following a fortuitous double deflection and added a sublime second with a wonderful curling finish after 24 minutes.West Brom improved significantly after the break but were powerless to prevent City extending their lead through captain Vincent Kompany’s thunderous 59th-minute header.City handed a league debut to Raheem Sterling but the England winger spurned a one-on-one chance and was generally overshadowed by his dazzling team mates Toure and David Silva before he was withdrawn in the second half.”I think for us we have something to prove as last season was below what we are used to,” Kompany told Sky Sports. “This is a team with a lot of intent.”For us, it was a good way to start our first game. We came out here today (Monday) knowing we had a point to prove. As a team, we all have to improve this season.”With…