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Tennis - ATP World Tour : Results and calendar for the season 1991
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- January
Date Place / Country Tournament Surface Winner / Status 07/01 - 13/01 
SydneyInternational Series 2 - Sydney Hard 
G. Forget07/01 - 13/01 
AucklandInternational Series 2 - Benson and Hedges Open Auckland Hard 
K. Novácek - February
Date Place / Country Tournament Surface Winner / Status 25/02 - 03/03 
NEDInternational Series 1 - ABN AMRO World Tennis Tournament Indoor 
O. Camporese - March
Date Place / Country Tournament Surface Winner / Status 04/03 - 10/03 
USAMasters Series - Indian Wells - The Newsweek Champions Cup Hard J. Courier15/03 - 28/03 USAMasters Series - Miami Hard J. Courier - April
Date Place / Country Tournament Surface Winner / Status 08/04 - 14/04 
BarcelonaInternational Series 1 - Torneo Godó Barcelona Clay E. Sanchez22/04 - 28/04 
MONMasters Series - Monte-Carlo Rolex Masters Clay S. Bruguera - May
Date Place / Country Tournament Surface Winner / Status 13/05 - 19/05 
UmagInternational Series 2 - Croatia Open Clay 
D. Poliakov13/05 - 19/05 RomaMasters Series - Roma Clay E. Sanchez - June
Date Place / Country Tournament Surface Winner / Status 10/06 - 16/06 NEDInternational Series 2 - 's-Hertogenbosch - Continental Grass Court Championships Grass 
C. Saceanu10/06 - 16/06 
LondonInternational Series 2 - London Queen's Grass 
S. Edberg - July
Date Place / Country Tournament Surface Winner / Status 08/07 - 14/07 BåstadInternational Series 2 - Båstad Clay M. Gustafsson15/07 - 21/07 StuttgartInternational Series 1 - Mercedes Cup Clay M. Stich22/07 - 28/07 NEDInternational Series 2 - Hilversum Clay M. Gustafsson29/07 - 04/08 
AUTInternational Series 1 - Kitzbuhel Clay K. Novácek - October
Date Place / Country Tournament Surface Winner / Status 14/10 - 20/10 AUTInternational Series 1 - CA-TennisTrophy - Vienne Indoor M. Stich28/10 - 03/11 FRAMasters Series - Paris-Bercy Indoor G. Forget - November
Date Place / Country Tournament Surface Winner / Status 04/11 - 10/11 
São PauloInternational Series 2 - São Paulo Clay 
C. Miniussi12/11 - 17/11 Frankfurt am MainMasters Series - ATP World Tour Finals Indoor P. Sampras