The 1923 International Lawn Tennis Challenge was the 18th edition of what is now known as the Davis Cup. For the first time, the competition was split into two zones: the America Zone and the Europe Zone. This change was necessitated by having more than 16 teams compete for the cup. The past several years had also seen a rise in the number of defaults, as teams from around the globe tried to work out the logistics of playing such an international tournament. Regional zones would help alleviate these problems.
The 1924 International Lawn Tennis Challenge was the 19th edition of what is now known as the Davis Cup. The tournament was, for the second straight year, divided into the America and Europe Zones. 17 teams competed in the Europe Zone, and 6 in America. China, Cuba, Hungary, Mexico, and New Zealand all competed for the first time, and South Africa and Austria returned to create the largest field to date.
The 1926 International Lawn Tennis Challenge was the 21st edition of what is now known as the Davis Cup. 19 teams would enter the Europe Zone, while 5 would enter the America Zone.
The 1927 International Lawn Tennis Challenge was the 22nd edition of what is now known as the Davis Cup. 21 teams entered the Europe Zone, while 4 entered the America Zone. Yugoslavia and Greece competed for the first time, while Germany returned to the competition for the first time since 1914.
The 1928 International Lawn Tennis Challenge was the 23rd edition of what is now known as the Davis Cup. 27 teams would enter the Europe Zone, while six would enter the America Zone. Chile, Finland, and Norway made their first appearances in the competition.
The 1930 International Lawn Tennis Challenge was the 25th edition of what is now known as the Davis Cup. For the silver anniversary, 24 teams would enter the Europe Zone, while 4 would enter the America Zone.
The 1933 International Lawn Tennis Challenge was the 28th edition of what is now known as the Davis Cup. 24 teams would enter the Europe Zone; while 9 would enter the Americas Zone, 4 in North America and 5 in South America.
The 1936 International Lawn Tennis Challenge was the 31st edition of what is now known as the Davis Cup. Due to the low number of competing South American teams, the North & Central America and South America Zones were scrapped and the Americas played in one unified zone. From this edition, the Qualifying Round system of the Europe Zone was scrapped. 19 teams entered the Europe Zone, while 4 teams entered the Americas Zone.
The 1938 International Lawn Tennis Challenge was the 33rd edition of what is now known as the Davis Cup. 21 teams entered the Europe Zone, while 4 entered the Americas Zone.
The 1939 International Lawn Tennis Challenge was the 34th edition of what is now known as the Davis Cup. 20 teams entered the Europe Zone, while 7 entered the America Zone.
The 1949 Davis Cup was the 38th edition of the most important tournament between national teams in men's tennis. 24 teams would enter the Europe Zone, and 4 teams would enter the America Zone. Israel made its first appearance in the competition.
The 1955 Davis Cup was the 44th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 24 teams entered the Europe Zone, 7 teams entered the America Zone, and 3 teams entered the newly reinstated Eastern Zone. Burma competed for the first time.
The 1956 Davis Cup was the 45th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 24 teams entered the Europe Zone, 5 teams entered the America Zone, and 3 teams entered the Eastern Zone.
The 1957 Davis Cup was the 46th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 24 teams entered the Europe Zone, 7 teams entered the America Zone, and 5 teams entered the Eastern Zone. Malaya, Lebanon and Venezuela made their first appearances in the competition.
The 1961 Davis Cup was the 50th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 28 teams entered the Europe Zone, 7 teams entered the Americas Zone, and 7 teams entered the Eastern Zone. Ecuador, Indonesia and Morocco made their first appearances in the tournament.
The 1963 Davis Cup was the 52nd edition of the Davis Cup, the most important tournament between national teams in men's tennis. 32 teams entered the Europe Zone, 9 teams entered the Eastern Zone, and 7 teams entered the America Zone. Rhodesia made its first appearance in the tournament.
The 1965 Davis Cup was the 54th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 31 teams entered the Europe Zone, 9 teams entered the Eastern Zone, and 5 teams entered the America Zone.
The 1966 Davis Cup was the 55th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 32 teams entered the Europe Zone, 8 teams entered the Eastern Zone, and 6 teams entered the America Zone.
The 1967 Davis Cup was the 56th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 32 teams entered the Europe Zone, 9 teams entered the Eastern Zone, and 7 teams entered the America Zone.
The 1968 Davis Cup was the 57th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 32 teams entered the Europe Zone, 9 teams entered the Americas Zone, and 8 teams entered the Eastern Zone. Peru made its first appearance in the tournament, having previously entered on 3 occasions before subsequently withdrawing before competing in a tie.
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