Madison Square Garden Open Tennis Championship

The  Madison Square Garden Open Tennis Championship also known as the Madison Square Garden Challenge Trophy and New York Indoor was a men's and women's open international indoor carpet court tennis tournament founded in 1968. It was organised by the USNLTA and played at Madison Square Garden, New York City, United States until 1970. This international tournament was part of the ILTF World Circuit until 1970 when it was replaced Clean Air Classic.

History
On 25 March 1968 the Madison Square Open Tennis Championship was established. The tournament was organised by the USNLTA and was played on indoor carpet courts. The first two editions were played in the standard tournament format, the 1970 and final edition was played as a round robin tournament with a 3rd and 4th place play off then a final.

In 1971 the owners of Madison Square Garden chose not to renew the tournament and the US tennis Association looked for a replacement New York Indoor event, they approached Combustion Equipment Associates Inc to sponsor a new event this lead to the Clean Air Classic that would be played across three venues in Hawthorne, New Jersey and the Vanderbilt International Raquet Club, culminating in the final at the Seventh Regiment Armory.

Men' singles
(incomplete roll)

Women's singles
(incomplete roll)