Juan Martin del Potro has opted out of next month’s Australian Open and his planned warm up event in New Zealand, organisers of the Auckland Classic announced on Saturday, PTI reported.

“Juan Martin del Potro has confirmed he will withdraw from the Australasian swing due to fitness issues,” the Classic organisers said in a statement, referring to the two tournaments in January.

“Del Potro confirmed via his management team overnight that he has not had sufficient recovery time and will be withdrawing from the (Auckland) Classic and the Australian Open.”

Del Potro had made a comeback this year after missing most of 2015 through injury. He began 2016 ranked 1,042th and finished at 38th after a meteoric rise which included wins over Stan Wawrinka, Novak Djokovic, Rafael Nadal and Andy Murray. He had recently led Argentina to their first Davis Cup crown.

Meanwhile, World No. 8 Madison Keys will also skip the Australian Open after undergoing wrist surgery, the American said on Friday.