International Series Tournaments
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International Series is a series of professional tennis tournaments held internationally that are part of the ATP Tour.International Series offer players cash prizes (tournaments have purses from $333,000 to 1,000,000) and the ability to earn ATP ranking points.
The locations and titles of these tournaments may be annually changed. The tournaments – in calendar order – are:
| Tournament | Place | Court surface | Prize Money(US$) | Draw Size | Since year |
| Next Generation Adelaide International | Adelaide, Australia | Hard | $419,000 | 32 Round Robin | 1974 |
| Qatar ExxonMobil Open | Doha, Qatar | Hard | $1,000,000 | 32 | 1993 |
| Chennai Open | Chennai, India | Hard | $436,000 | 32 | 1996 |
| Medibank International | Sydney, Australia | Hard | $436,000 | 32 | 1975 |
| Heineken Open | Auckland, New Zealand | Hard | $436,000 | 32 | 1975 |
| PBZ Zagreb Indoors | Zagreb, Croatia | Indoor Carpet | $416,000 | 32 | 2006 |
| International Tennis Championships | Delray Beach, Florida | Hard | $416,000 | 32 Round Robin | 1993 |
| Movistar Open | Vina del Mar, Chile | Clay | $448,000 | 24 Round Robin | 1993 |
| Open 13 | Marseille, France | Indoor Hard | $600,000 | 32 | 1993 |
| Brasil Open | Costa do Sauipe, Bahia, Brazil | Clay | $456,000 | 32 | 2001 |
| SAP Open | HP Pavilion-San Jose, USA | Indoor Hard | $416,000 | 32 | 1974 |
| Copa Telmex ATP Buenos Aires | Buenos Aires, Argentina | Clay | $445,000 | 32 Round Robin | 1993 |
| Tennis Channel Open | Las Vegas, USA | Hard | $416,000 | 32 Round Robin | 1986 |