Manchester United striker Wayne Rooney
says facing bitter rivals City in the Community Shield is the "best way to start" the season.[LNB] Sunday's Wembley clash gives a spicier-than-normal edge to United's final pre-season encounter.[LNB]It also provides the opportunity to avenge last season's FA Cup semi-final defeat by Roberto Mancini's men, which open up the path towards an end to the Blues' 35-year trophy drought.[LNB]Not surprisingly, with the Premier League title to defend, Rooney is anxious not to give City any hope of an improvement on their own impressive third placed finish last term.[LNB]"You couldn't get better motivation to start the season with a bang," the England striker told Four Four Two magazine.[LNB]"I hadn't even thought about it until I turned on the TV and someone was talking about potentially the best Community Shield ever.[LNB]"Playing City is the best way to start."[LNB]Although the FA Cup semi-final was a disappointing day for United, the Red Devils will never forget Rooney's sensational winner in the Old Trafford league meeting between the two sides a couple of months earlier.[LNB]It went a long way towards United's record 19th league championship, although Rooney acknowledges it will be even harder to retain the crown considering the number of challengers jostling for position.[LNB]"The names are obvious," he said.[LNB]"When you are at a club like Manchester United, you pretty much know what the goals are. We want to win the league, the Champions League and both cups.[LNB]"It is pretty simple. Obviously, you fall short sometimes but at Manchester United, you have to keep striving for it."