European heavyweights Germany and Portugal face each other in Group G's opening game in Salvador on Monday.
Here, Press Association Sport looks at the players who are likely to have an influence.
JEROME BOATENG v CRISTIANO RONALDO
There has been plenty of debate about the fitness of Ronaldo and while that may slightly lessen Boateng's difficult task, he will have his hands full containing the trickery of the Real Madrid forward if Portugal can give him enough of the ball.
PHILIPP LAHM v JOAO MOUTINHO
The versatile Lahm will be played as a defensive midfielder again and he will be the linchpin dictating the tempo. After a disappointing first season with Monaco, Moutinho is not in the best of form but will be required to help get a grip on an area Germany tend to dominate.
THOMAS MULLER v PEPE
Muller is not an out-and-out centre-forward but will be asked to do a job up front again, and while he is better coming from deeper positions, his movement may benefit team-mates. Pepe's qualities are often overlooked because of his no-nonsense approach to defending which occasionally gets him into trouble, but he is a tough, experienced opponent.