It was the 25th edition of the tournament which was part of the 2011 WTA Tour.
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It was the 18th edition of the tournament which was part of the 2011 ATP World Tour and the 2011 WTA Tour.
It was the 37th edition of the event, known as the BNP Paribas Open, and was classified as an ATP World Tour Masters 1000 event on the 2011 ATP World Tour and a Premier Mandatory event on the 2011 WTA Tour.
The 2011 Dubai Tennis Championships (also known as the 2011 Dubai Duty Free Tennis Championships for sponsorship reasons) was a 500 Series event on the 2011 ATP World Tour and a Premier 5 event on the 2011 WTA Tour.
It was the 22nd edition of the Estoril Open, and was part of the ATP World Tour 250 series of the 2011 ATP World Tour, and of the International-level tournaments of the 2011 WTA Tour.
It was the 68th edition of the event and was classified as an ATP World Tour Masters 1000 event on the 2011 ATP World Tour and a Premier 5 event on the 2011 WTA Tour.
It was the 22nd edition of the Kremlin Cup, and was part of the ATP World Tour 250 Series of the 2011 ATP World Tour, and of the Premier Series of the 2011 WTA Tour.
It was the 19th edition of the Open GDF Suez (formerly known as the Open Gaz de France) and was a Premier tournament on the 2011 WTA Tour.
The Regions Morgan Keegan Championships was part of the ATP World Tour 500 series on the 2011 ATP World Tour, and the Cellular South Cup was an International-level tournament on the 2011 WTA Tour.