Roger Federer has been warned he must improve his level if he is to beat Novak Djokovic at the ATP Finals tonight.
The two tennis legends meet for the 49th time with a place in the semi-finals up for grabs for the winner.
Both stars have lost to Dominic Thiem in the group stages and are now fighting to extend their season by a couple of days.
But Hantuchova thinks Djokovic will come out on top if Federer does not find his top form.
“To me it is going to be about who will serve better,” Hantuchova told Amazon Prime.
“Obviously Novak has been serving incredibly well since the Paris indoor week.
“Roger is the one that needs to pick up his intensity and play much better.”
Djokovic failed to convert a match point against Thiem in his previous match but had he done so it could have been a different scenario.
“Mentally it can be a little bit tricky for Novak because he was one point away from not having to be in this situation,” Hantuchova added.
“It could have been a much more enjoyable match for him not having the pressure he has to face tonight.
“The only task he has to overcome is the way his tennis comes but if he plays as well as he did against Dominic he doesn’t have to worry.”
Meanwhile, Federer believes his serve improved in his previous outing against Matteo Berrettini.
He said: “That’s maybe what the difference was against Dominic. I’m not sure. But I was missing the spots, going through second serves on breakpoint, and I felt like Dominic made me pay for it.
“Plus I felt like he was trying to actually do something on the return, as well, on my second serves.
“I think this is where we are today on the indoor court. You have to take it to your opponent.
“So I tried to make the first serves, and then from then on stay aggressive but not just give away the break if that’s what happened.
“I wanted to see Berrettini play a good point, a great point, actually, to get the point. And I felt against Thiem I just didn’t do that.
“I was maybe a tiny bit too hectic still, and I misfired on the serve. Sometimes that’s all it takes to make a difference.”