It was held in Denver , Colorado in the United States ( in 1991 : Aurora , Colorado , at a nine miles ' distance from Denver ) .
It was played on indoor hard courts from 1972 to 1984 and on indoor carpet courts from 1985 to 1991 .
It was held in Denver , Colorado in the United States ( in 1991 : Aurora , Colorado , at a nine miles ' distance from Denver ) and played on indoor hard courts from 1972 to 1984 and on indoor carpet courts from 1985 to 1991 .