The Indian Open originally called the All India Championships or formally the All India Lawn Tennis Championships and also known as The National Lawn Tennis Championships of India and later the Indian International Championships is a defunct combined (men's and women's) tennis tournament. It was played from 1910 until 1982 and the men's event was part of the Grand Prix tennis circuit, 1970 to 1979. It was held in various cities in, India and was played outdoor on multiple surfaces. Ramanathan Krishnan won most titles during the pre-Open era with six titles and Vijay Amritraj won most titles during the open era with four titles.