India beat Afghanistan by 23 runs in their opening encounter of the ICC Twenty20 World Cup cricket tournament at Colombo. Chasing a victory target of 160 runs yesterday, Afghanistan could score 136 runs.In another match in Colombo, Australia beat Ireland by seven wickets. All rounder Shane Watson was adjudged the Man of the Match for his all round performance.In today's encounter, South Africa will take on Zimbabwe in a Group 'C' match at the Mahinda Rajapaksa International Stadium in Hambantota.