Sony Ericsson WTA Tour

Being No.1 in singles does not guarantee doubles success, though a handful of players have had tremendous results in both.

One storyline of 2009 was a Spanish duo making its case for best team on the Sony Ericsson WTA Tour.

Nuria Llagostera Vives and María José Martínez Sánchez look to build on their terrific 2009 season.

Nuria Llagostera Vives and María José Martínez Sánchez won their biggest title ever in Doha.

For the third straight year, Cara Black and Liezel Huber will finish the season at No.1 in the world in doubles.

Nuria Llagostera Vives and María José Martínez Sánchez will face Cara Black and Liezel Huber.

Cara Black and Liezel Huber aren't just defending their title, but the No.1 ranking as well.

Maria Kirilenko and Nadia Petrova and Iveta Benesova and Barbora Zahlavova Strycova won doubles titles last week.

The doubles event at the Tour Championships has a rich history, with Martina Navratilova all over the record book.

Anna-Lena Groenefeld and Katarina Srebotnik were the champs in Linz, while Chuang Chia-Jung and Lisa Raymond were victorious in Osaka.