Nadal ready for third comeback

After struggling with a knee injury in 2012, Nadal's was again sidelined in 2014, first by an injury and then by appendicitis. 

The Spaniard struggled on his return to competitive action, losing to Michael Berrer in the first round of the Qatar Open.

However, the former world number one was much sharper when he featured in the Fast4 event on Wednesday.

Speaking after the match, Nadal refused to get too carried away with predictions for the upcoming Australian Open,

"This is the third comeback of my career after injury, so we will see how it goes," he mused.