The World Cup final pits Argentina's emotional, Messi-driven attack against Spain's precise, possession-based control. Argentina reached the final through dramatic wins over Egypt, Switzerland and England, powered by the 39-year-old Messi's brilliance.
Spain enters unbeaten in 37 matches, seeking a second World Cup title. Their route has been methodical under coach Luis de la Fuente, who mentored Argentina's Lionel Scaloni during his coaching education.
A compelling subplot is the meeting between Messi and 17-year-old Lamine Yamal, Barcelona's latest La Masia prodigy. The pair share a famous viral image of Messi bathing Yamal as an infant.
Conditions in New Jersey could favor Argentina, with pitch quality and hot, humid weather potentially disrupting Spain's rhythm. Wildfire smoke from Canada has also blanketed the region with hazardous air.