Campionati Internazionali di San Marino

San Marino GO&FUN Open
ATP Challenger Tour
Event name	San Marino
Location	City of San Marino, San Marino
Venue	Centro Tennis Cassa di Risparmio di Fonte dell'Ovo
Category	ATP Challenger Tour
Surface	Clay (Red)
Draw	32S/16Q/16D
Prize money	€64,000+H

The San Marino GO&FUN Open (formerly known as the San Marino CEPU Open) is a defunct professional tennis tournament played on red clay. It has been part of the Association of Tennis Professionals (ATP) Challenger Tour. It was held annually at the Centro Tennis Cassa di Risparmio di Fonte dell'Ovo in the City of San Marino, San Marino, since 1988 (as a Challenger in 1988, as a Grand Prix Regular Series tournament in 1989, as an ATP World Series tournament from 1990 to 1997, as an ATP International Series tournament from 1998 to 2000, and as a Challenger again from 2001 until 2014).