Monday is likely to see a battle of youth against experience as Portugal and Uruguay go head-to-head in a difficult Group H, with Portugal looking for revenge for the 2-0 defeat to Uruguay that knocked them out of the last-16 in Russia four years ago.
As usual, most eyes will be on Cristiano Ronaldo after his controversial penalty against Ghana saw him become the first player to score in five consecutive World Cups.
Ronaldo was voted the 'Man of the Match' in that 3-2 win, but a closer look at his performance shows just how much his style of play has changed in recent years, with the 37-year-old now becoming a much more static presence in attack, when a few years ago, his powerful runs from deep, cutting in from the flanks were his main strengths.