Sara Errani and Roberta Vinci are officially sharing WTA doubles Year-End World No.1

That Wimbledon triumph gave Errani and Vinci a Career Doubles Grand Slam, making them just the fifth doubles team in the Open Era to achieve the feat after Martina Navratilova and Pam Shriver, Kathy Jordan and Anne Smith, Gigi Fernández and Natasha Zvereva, and, of course, the Williams sisters. 

 There's more - having already finished as co-No.1s in 2013, repeating the feat in 2014 makes them just the second team in WTA history to finish multiple years as co-No.1s, after Cara Black and Liezel Huber (the Zimbabwean-American duo achieved the feat three times in 2007, 2008 and 2009). 
The only other team to achieve the feat was Lisa Raymond and Samantha Stosur (who did it once in 2006). 
 This will be Errani and Vinci's 60th career week as co-World No.1s in doubles together, the second-longest stint as co-No.1s in WTA history. 

Here's the full list in order of most weeks... 

27 weeks - Cara Black &Liezel Huber 
60 weeks - Sara Errani & Roberta Vinci 
39 weeks - Lisa Raymond & Sam Stosur 
20 weeks - Liezel Huber & Lisa Raymond