Roger Federer and Rafael Nadal face tricky opponents in the fourth round of the Australian Open on Monday.
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Both the big guns have eased through the previous three rounds, but a couple of real tests await them in round four in Melbourne.
Federer, the number six seed, will be up against the ridiculously talented, yet you-never-know-what-you-are-going-to-get-from-him Jo-Wilfried Tsonga, who is the number ten seed at the Australian Open.
"I mean, he clearly is going to surprise you just by shot-making or whatever it is," Federer, who is quite familiar with Tsonga's prowess, said after his third round victory over Teymuraz Gabashvili.
"Today [Saturday] I didn't know if my opponent liked the inside out forehand more or the inside in forehand or more the backhand down the line or backhand crosscourt.
"So sometimes I'm like, Okay, too late. It was a winner. With Jo Willy it's going to be different. If he hits a winner, I know probably where he's going to go, what the percentage is.
"But then again, because he hits it so well and so consistently, that's what makes it hard then, you know. He's got a huge serve, which then is also is a huge part of the game which increases the pressure or not on your own service games.
"He's a great mover. So, you just know what to expect, which is good for better tennis for both players."
Federer will potentially face Andy Murray, who takes on Stephane Robert of France in the fourth round, in the quarterfinal if both the big names go through, with Rafael Nadal also lying in wait in the semifinals.
"I have had tough draws throughout my career," Federer said. "Not every time, but I have played what, 60 slams and many tournaments, so I remember tough draws in early rounds.
"Clearly now it's not how it used to be when there was only 16 seeds and I was the 32 seed. Now with the 32 seeds it's a bit more predictable. A lot more predictable actually.
"That's one of the reasons I think I have always been able to go deep in slams, especially once I got was able to be seeded. I took advantage of that.
"This is clearly, you know, a tough draw I have had, especially looking forward now. But important now for me is just that I keep playing well and I don't go crazy of who I play now."
Nadal is up against Japanese 16th seed Kei Nishikori on Monday, and while the Spaniard will be the overwhelming favourite, especially after the manner in which he dispatched the dangerous Gael Monfils, the world number will know he cannot afford to relax even a little bit.
"Kei is a great player," Nadal said. "He's able to play very aggressive, make very easy the very difficult things. He's very quick on the movements. Will be a very tough opponent for me.
"I think he had a very good victory [in the third round]. He's playing great. [It] will be a tough one. I need to keep playing the way that I played [against Monfils]."
