Spain's Rafa Nadal said he cannot guarantee he will make the trip to Melbourne for next month's Australian Open after returning to action at the Mubadala World Tennis Championship in Abu Dhabi.

Rafael Nadal 'can't guarantee' participation at Australian Open, says need to be healthy enough

The Spaniard will face Gael Monfils in the fourth round, while Milos Raonic beat Simon to progress to the next round

Australian Open: Rafael Nadal staves off Zverev challenge

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Rafael Nadal 'can't guarantee' participation at Australian Open, says need to be healthy enough

Australian Open: Rafael Nadal staves off Zverev challenge