If we were going to compare the two, it would be obvious that the night sessions have dominated the day sessions this tournament. Sunday's night session provided another absolute thriller between Nick Kyrgios and Andreas Seppi. Andy Murray finally seemed really challenged in a match, but he pushed through. He is flying under the radar after a mediocre (by his standards) 2014, but don't look past him. And Novak Djokovic hasn't really yet been challenged this tournament. That could be a double-edged sword, though, since he hasn't really yet faced a level of competition that can really challenge.

Honor Roll:

Nick Kyrgios (defeated Seppi 57 46 63 76 86)- There are not enough good things to say about Kyrgios after this match. He is still young and we shouldn't get ahead of ourselves, but he just showed us a veteran poise in an impossible situation. The never-say-die attitude he showed will stand him well in his career. When combined with a booming serve and an elite baseline power game, we are looking at a potential star in the not-so-distant future.

Kei Nishikori (defeated Ferrer 63 63 63)- This was a comprehensive performance from Nishikori, who just beat Ferrer from the baseline. And while Ferrer was clearly not at 100%, outworking Ferrer into opening the court is still a tall task for anyone, and Nishikori did it beautifully. Last year, it was Djokovic who provided an epic challenge for Wawrinka in the quarterfinals. Don't be surprised if Kei does the same this year.

Room for Improvement:

David Ferrer-I can't critique Ferrer too much. He clearly had very little left in the tank after a grueling third-round match against Gilles Simon. You just wonder if maybe he could have done a little more. This is not so much a statement of disappointment in Ferrer as it is an acknowledgement that maybe he can't quite play the back-to-back extended grinds that he used to.

Stanislas Wawrinka (defeated Garcia-Lopez 76 64 46 76)- Guillermo Garcia-Lopez has been playing an incredible tournament here, but Wawrinka is definitely a step below where he was at this point last year. He probably should have lost the fourth-set tiebreak, and he never really felt like the better player in this match. He will have to rise to the occasion in his next match, as we know he can do, or he will be in a world of trouble against Nishikori. 

Grigor Dimitrov (lost to Murray 46 76 36 57)- At this point in Grand Slams, when top-10 players are meeting, it might be a bit unfair to critique the losers too much. At this point, how a player loses says a lot more than the fact that he lost. Dimitrov never found a way to get comfortable in this match against Murray. More importantly, though, he got tense when he had a chance to win the match and quickly unraveled. It's that final push through the finish line that he will need to learn how to make if he wants to win Grand Slams someday.

Match of the Round:

Forget this round, that Kyrgios/Seppi match was the match of the tournament. And it's quite possible, when we're looking back on this in 11 months, that it will be in contention for match of the year.

First of all, it has all of the pre-conditions for an epic match. It has a compelling matchup:  a rising, hard-hitting youngster versus a wily veteran who uses the court well. Kyrgios is at his home major, and it was the farthest he had progressed there to date; Seppi had matched his best performance here and was fresh off his first career upset of Roger Federer. Of course, that is slightly mitigated by the fact that Kyrgios upset Rafael Nadal at Wimbledon last year.

The match began with a rather predictable excitement. The contrast in styles provided enjoyable points and, in the end, the server managed to protect himself. At the tail end of each of the first two sets, Seppi found a way to break Kyrgios and serve out the set. The match looked to be strongly in Seppi's favor, but it couldn't be considered comfortable. Kyrgios still had the better serve and bigger groundstrokes. It would only take a small lapse in concentration by Seppi to lose a set.

We saw that lapse in the third set. Kyrgios got a break and only gave up three points on serve all set. Result: set Kyrgios. Kyrgios had similar (although not quite as untouchable) success on serve the next set, but so did Seppi. Neither player saw a break point leading to a tiebreak. Kyrgios stood tall on a crucial backhand to take the deciding minibreak and the set–and all of a sudden, we were heading to a fifth.

Kyrgios went up a break early in the fifth set but got broken back. Still, he held on and broke Seppi to love for the dramatic 8-6 victory. But that wasn't the full story of this match. Kyrgios bordered between youthful impetuousness and slight disrespect the whole match. He would bounce his racket off the ground, make gestures, and got away with numerous audible obscenities. He is only a teenager, though, and the crowd loved him for his antics. He owes this victory as much to the fact that this was played in Melbourne as anywhere. He could be himself in a way that the crowd in London or New York City never would have accepted. Then again, why wouldn't the crowd love him for this? After all, he's providing them the best chance they've seen in a decade. Andy Murray's up next.