Emma Raducanu named two players while revealing what she is 'scared' about when it comes to the US Open mixed doubles.

"Ben Shelton's serve, that scares me, that's probably one in particular," she said.

"And then obviously all the guys. It's very difficult to return their serves. Reilly Opelka? He's serving from a stepladder. It's incredible.

"Of course, I'm very excited. It's such a unique opportunity and I think a lot of the females will probably be feeling the same way.

"Returning the guys' serve is quite difficult."