Fifth-ranked Juan Martin del Potro will miss the Australian Open as he continues his recovery from a knee injury.
"I hope you have a great 2019. 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 ... but I'm happy with my progress."
The U.S. Open finalist fractured his right kneecap after a fall at the Shanghai Masters in October.
The Australian Open begins Jan. 14.
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