Peter Debruge Chief Film Critic Anyone who’s ever played tennis knows the game starts with love and escalates fast. In Luca Guadagnino’s hip, sexy and ridiculously overheated “Challengers,” the rivals are former doubles partners Art Donaldson (Mike Faist) and Patrick Zweig (Josh O’Connor), best friends since the age of 12, who went their separate ways after both players fell for the same woman. Patrick got there first, but Art wound up marrying her — and their sense of competition has only intensified since.