Juan Martin del Potro to miss Australian Open with knee injury

MELBOURNE, Australia -- Fifth-ranked Juan Martin del Potro will miss the Australian Open as he continues his recovery from a knee injury.

"Recovery is going great and I will tell you later where I will be making my comeback," the 30-year-old Argentine wrote on Twitter. "Unfortunately it won't happen in Australia."

The US Open finalist fractured his right kneecap in a fall at the Shanghai Masters in October.

The Australian Open begins Jan. 14.