Mario Mandzukic's second-half equaliser earned Croatia a vital draw against Italy to leave Group C wide open.Croatia knew three points in Poznan would clinch their last-eight spot following an impressive opening 3-1 win against Republic of Ireland.The Italians were in total control after taking the lead through Andrea Pirlo's wonderful first-half free-kick.But Mandzukic's third Euro 2012 goal means they must beat Ireland to be certain of their quarter-final place.