Belgian Indoor Championships

Donnay Indoor Championships
Defunct tennis tournament
Event name	Brussels Indoor
Tour	ATP Tour (1990–92) Grand Prix circuit (1980–88)
Founded	1981
Abolished	1992
Editions	11
Location	Brussels, Belgium
Venue	Forest National
Surface	Carpet (i)

The Brussels Indoor (also known as the Donnay Indoor Championships) is a defunct professional tennis tournament played on indoor carpet courts at Forest National in Brussels. It was part of the Grand Prix tennis circuit initially and later, for three years, the ATP Championship Series of the ATP Tour. The tournament was established in 1980, becoming the second tournament to be played in Brussels, along with the ATP Brussels Outdoor. The following year the outdoor tournament was played for the last time, leaving the Donnay Indoor Championships as the sole professional tournament in the region.

It was held between 1981 and 1988 and then again from 1990 until 1992.

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