What you mean a contract-single?
Contract with who, why, how?
The label tapped Guetta to submit songs for the album, the label obviously chose two, in return Guetta created an agreement that at least one of the songs that made the album would be a single.
So Right Now is a US-only single? I can't at her label releasing a ballad like What Now in the heat of summer. Labels always try to pull that summer ballad move & it almost never works, including Rihanna herself with California King Bed two years ago. Unless the ballad is really light & summery like #Beautiful it's not going to work.