Shane Watson blasted an unbeaten 51-ball 90 to guide Rajasthan Royals to an easy victory by seven wickets against Pune Warriors in the Indian Premier League season-V here at the Subrata Roy Sahara Stadium on Tuesday. Chasing an easy target of 126, Rajastahan Royals completed the seven-wicket win in 16.2 overs. Australian opener Watson, who batted dominantly in the innings, hammered four sixes and ten fours. Earlier, Pune Warriors captain …