2018 FIFA World Cup: Two championship teams should dominate Group B

The 2018 FIFA World Cup begins Thursday with the hosts Russia taking on Saudi Arabia in the opening game of the tournament (9 a.m., TSN / CTV).
The most compelling game of the first round, however, could take place Friday (noon, TSN) when Cristiano Ronaldo and defending European Champions Portugal take on the 2010 World Cup Champions Spain in a Group B match.
Portugal and Spain are both expected to move on to the knockout stages of the tournament, grouped with Morocco and Iran. Who finishes firs