Keen to put the Sunil Narine controversy behind them, Kolkata Knight Riders will begin their title defence against a formidable Mumbai Indians side in the IPL cricket opener at the Eden Gardens, on Wednesday. The West Indies mystery spinner, who was reported for suspect action in CLT20 and went on to miss the recently-concluded World Cup, was kept waiting before getting a clean chit by the BCCI on Sunday. A team which has gone on to win two titles (2012 and 2014) since the acquisition of the Trinidad off-spinner in 2011 faces the biggest challenge this year as Narine's effectiveness with a re-modelled action is yet to be seen.