Portugal are doing what Portugal have done so well over the last few years in tournament football, picking up narrow wins over weaker teams and stalemates with everyone else, and except for a defeat to Germany in Die Mannschaft’s 2014 triumph, they're unbeaten in normal time across the past two Euros, the World Cup in Brazil and last summer’s Confederations Cup. They've won to nil in the last four of these against sides ranked outside the world’s top 20, and given the Iranians are set up to defend, with limited attacking intent, that appears an inevitable outcome.
Carlos Queiroz's side conceded just two goals in qualification, and though they faced inferior competition compared to what Portugal will provide, they were able to put up a fight against Spain as they lost 1-0 – the same result they achieved at the last World Cup against eventual finalists Argentina. With Iran knowing a victory for themselves would catapult them into the knockout rounds, they're likely to open up just a little as the game wears on should Portugal struggle to get that first goal, but in all likelihood that would merely play into Portugal’s hands.
Ronaldo is simply on fire at the moment and has every chance of finishing with the golden boot. He’s scored 24 times in his last 19 internationals, including the first of the game in eight of the last nine in which he found the net, and at the prices is a great selection.