Sara Errani and Roberta Vinci are the ninth pairing to share the World No.1 doubles ranking.
WTA Staff

With Sara Errani returning to World No.1 alongside doubles partner Roberta Vinci this week, the Italians became the ninth duo to share the top spot on the doubles rankings. As long as they keep playing together exclusively, they could be there a while - as they have a significant points lead.

So, which of the co-World No.1s shared the spot the most weeks? The least? See below:

DuoDatesWeeks
Raymond & StubbsAug 21, 2000-Sept 10, 20003
Ruano Pascual & SuárezAug 2, 2004-Aug 22, 20043
Raymond & StosurJuly 10, 2006-April 8, 200739
Black & HuberNov 12, 2007-April 18, 2010127
Williams & WilliamsJune 7, 2010-Aug 1, 20108
Dulko & PennettaFeb 28, 2011-April 17, 20117
Peschke & SrebotnikJuly 4, 2011-Sept 11, 201110
Huber & RaymondApril 23, 2012-Sept 9, 201220
Errani & VinciApril 29, 2013-?1 (so far)