The Golden State Warriors signed the largest of the NBA ad patch deals this week, selling the space on its jersey for the next three years to Japanese tech holding company Rakuten.

Sources say the deal is worth $20 million a year, nearly doubling the second-highest deal signed by the Cleveland Cavaliers.

The Warriors will sport Rakuten's genuine logo with red and black on their white jerseys and a white version of the logo on the blue-and-slate jerseys.

Rakuten, which owns business like cash back site ebates, messaging app Viber and ebook brand Kobo, has ratcheted up its sponsorship spend of late. In July, its name started appearing on FC Barcelona's kit in a deal worth $235 million over four years.

"We love sports," Rakuten founder and CEO Hiroshi Mikitani told ESPN. "There's a lot of emotion to it -- great stories, smiles and tears."