Their epic Wimbledon final from last summer seems like a long time ago but Rafael Nadal and Roger Federer will renew their rivalry once again this evening as they vie for the men’s title at the Australian Open. This will be their seventh showdown in a Grand Slam final and it’s quickly becoming a must-see rivalry not unlike the Red Sox-Yankees or Lakers-Celtics for all sports fans.

Losing his #1 ranking in the world after Nadal’s thrilling victory in England has been a major catalyst in the revitalization of Federer’s career. He has added intensity and motivation to his smooth, effortless return volley game and hasn’t lost a match at a Grand Slam tournament (including a U.S. Open title last September) since Wimbledon.

Federer will be making his 18th appearance in a Grand Slam final and a victory Sunday evening in Melbourne will put him even with Pete Sampras at 14 Grand Slam tournament victories. His hard-court surface record is also very impressive, as Federer has won seven of the last eight Grand Slam tournaments played on that surface, including winning five straight U.S. Open titles.

The tennis world anointed Nadal as the new king of the sport last summer. The young Spaniard emerged at a time when tennis needed someone to challenge Federer’s dominance. Nadal will never emulate Roger’s play on the court, his sweating and grunting and his fist-pumping, emotional style are all big parts of his game. His top spin forehand shot will be taught to future generations for years to come.

The key to Nadal’s long-term success will be his play on hard-court surfaces. On clay, he has no equal, but Nadal’s improved play on the hard court and grass last year helped him take over tennis’ #1 ranking. Winning Wimbledon was a memorable moment in Nadal’s career, but winning on the hard-court in Melbourne tonight would be just as impressive.

The tennis world was bracing for an unknown to knock off Nadal or Federer, but for the past two weeks they reminded everyone just how good they are. The match is on in the wee hours of Sunday morning (3:30 AM ET) on ESPN2 here in the U.S., but the network is replaying the match later in the morning.