The ATP Cup is an international men's tennis tournament that features national teams competing against each other. It was first held in 2020 and is organized by the Association of Tennis Professionals (ATP). The event takes place in early January, serving as a lead-up to the Australian Open. Teams are composed of top-ranked players from various countries, and matches include singles and doubles formats. The tournament aims to promote tennis globally and offers ranking points, prize money, and national pride for the participating countries.