Take a look here: Twitter showcases live streaming capabilities with Wimbledon coverage - Digiday (http://digiday.com/platforms/twitter-livestream-wimbledon/)

From the article:

“Twitter is increasingly a place where people can find live streaming video, and that includes exciting sporting events like Wimbledon,” Twitter said in a statement. “This livestream is an extremely early and incomplete test experience, and we’ll be making lots of improvements before we launch it in its final form.”

Andrew