The ball fell nicely for David Silva, who played it into the path of Mahrez and the Algeria worldwide squared it for Sterling to tap into an empty net for his second.
"We deserved to win by far".
Sterling's opening goal following a goalless first half was awarded after originally being ruled out for offside. Nevertheless, officials are guided that it is proximity to the ball that takes precedence, and Sterling's goal should have been disallowed.
The third goal was Sterling's 15th of the season in the Premier League, and he is just three behind teammate and leading marksman Aguero.
Watford did find some consolation with a goal of their own in the 66th minute courtesy of Gerard Deulofeu, 3-1.
The visitors, who seemed to have one eye on their FA Cup quarter-final next weekend, improved after bringing on Deeney and Deulofeu and the latter scored with his first touch to reduce the deficit. I was hoping my goal didn't get cancelled out.
"The first half was difficult even for myself, it was hard to break them down", Sterling said. The crucial first goal arrived less than 45 seconds into the second half but it was originally ruled out for offside, then it was allowed due to a odd perception of the offside rule. "We got it and it kick-started our game".
"I think we played very good in the first half - defensively ideal, collectively doing a very good performance", said the Spaniard.
Meanwhile, Liverpool have settled to share the spoils in their last three league games but the two-time Premier League victor thinks they are capable of winning their maiden league title despite behind a point behind leaders Manchester City.
A statement was released which explained the Premier League's request to City for information on the matter and, according to the Daily Mail, the body came under pressure from the American owners of Liverpool among others to act on the situation. There are no spaces, just the talented players we have.
Sterling's opening goal was hotly disputed as he was initially flagged offside, but referee Paul Tierney overruled the decision after a three-minute discussion with his linesman.
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