Breaks the deadlock
The in-form Rooney had a first-half strike disallowed as the Baggies battled hard for 45 minutes to maintain parity.
However, United flew out of the traps after half-time and the goal came on 56 minutes before setting-up Ronaldo for the second thirteen minutes later.
The result was put beyond doubt as Berbatov struck on 72 minutes. Nani's quick cross bounced through the legs of Throstles defender Jonas Olsson and the Bulgarian was on-hand to poke home from close range. Nani then got on the scoresheet himself as he knocked home a Rooney pass in the dying moments.
This was a comprehensive win from United and Fergie will be delighted with another rampant display. There was a cautious but impressive 65 minutes from Brazilian youngster Rafael Da Silva, whilst Rooney has blown away his pre-season critics with another stunning performance.
Next up is the much-anticipated clash with Glasgow Celtic on Tuesday before United make the short trip to Merseyside to face Everton.
Full Time - Manchester United 4-0 West Bromwich Albion
Attendance - 75,451
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