The Australian Open has been an enthralling event so far and there are still many enticing second round matches to come.
Players such as Bernard Tomic, Alexandr Dolgopolov and John Isner have managed to stay in the draw through five-set battles while others such as Roger Federer have faced little to no trouble at all.
The matchups for the afternoon will prove to be matches that go the distance while the night matches might lean more towards one side due to the better player taking advantage of the situation and the crowd.
Take a look at the most anticipated matches for today and tonight.
Federer has won nine out of ten meetings between the two and has only dropped four sets to the almighty serving giant.
However, Karlovic has already gotten a big win under his belt, upsetting Jurgen Melzer in the first round in straight sets.
If Dr. Ivo loses the first set, expect Roger to win in straights, and if he wins it, still expect Rog to come through in four.
The two very talented up-and-comers on the tour are going to go at it again.
Tomic has never beaten the Ukrainian in three meetings, but neither player enjoys the other's style.
This match can go either way, and although Dolgo is the better player overall, he has been in a funk this tournament.
Expect this to be the most exciting match of the day.
Aussie favorite Kim Clijsters is one of the favorites to win the tournament. However, Hantuchova is a giant-killer and a veteran with much experience.
This match should be a fun three-setter but of course it is hard to think Aussie Kim will fall this early in the tournament.
The big question will be whether or not big man John Isner is tired from his five-set marathon match against David Nalbandian, which ended 10-8 in the fifth.
While Isner had to come back from two-sets-to-one down, Feliciano Lopez has faced no trouble at all and has not dropped a set in his first two matches.
This will be a serving exhibition, so expect many tiebreaks to result.
This will be yet another serving exhibition although both men are literal giants and can pack a punch on ground strokes.
Expect this match to go four or maybe even five sets and look forward to Kevin Anderson making a name for himself in this major.