Tsitsipas' 3 qualities Nadal needs to be wary of in the Australian Open 2019 Semi-Final

#2 ACE IN NUMBERS

Tsitsipas has hit close to 20 aces in all his matches here in Melbourne. He's found to be using aces to protect his serves and secure quick and consecutive points easily. As a matter of surprise, he put 20 aces past Federer and surpassed the ace master's paltry tally of 12.

One simply can't do much about aces, still, Nadal may have to think about his returns for the rest of the serves coming his way. Here, his best bet may be to try and at least fire the ball over the net as many times as possible.