The Paris Olympics has its dream men's gold medal match with Carlos Alcaraz blitzing his semi-final to set up a meeting with the sport's long-time dominant force Novak Djokovic.
And in the women's tournament, two underdogs will duel for a surprise gold: China's Zheng Qinwen and Donna Vekic, of Croatia.
All four finalists are out to claim a first gold, but only one pairing has a combined 28 grand slam titles.
The top two men's seeds won through on Saturday (AEST) to replicate last month's Wimbledon final and offer both men a shot a history.
Alcaraz, 21, hopes to become the youngest man to win an Olympic tennis singles gold.
Djokovic, 37, has the chance to be the oldest, and also claim the sole piece of tennis silverware yet to be in his possession.
The Serbian all-time great won through to his first Olympics final with a 6-4 6-2 dismissal of Italy's Lorenzo Musetti, while Alcaraz was even more efficient in his semi, winning 6-1 6-1 over Felix Auger-Aliassime of Canada.
Alcaraz was utterly dominant.
He never faced a break point. He won the point on 10 of 11 trips to the net. He made just 13 unforced errors, 10 fewer than Auger-Aliassime, who also lost to the Spaniard at this year's French Open. It all took him little over an hour on court.
“I just couldn’t find a way to be comfortable in any pattern, any position," Auger-Aliassime said.
"Whether it was trying to dominate the forehand cross-court or change of direction, the forehand inside-out, the backhand side ... every aspect. The movement. The defence. I was dominated.”
Djokovic was less ruthless, dropping serve twice, but closed out the contest in one hours 46 minutes for his first Olympic semi-final win.
He had lost in the last four to Rafael Nadal (Beijing), Andy Murray (London) and Alexander Zverev (Tokyo) at previous Games, all of whom went on to claim gold.
Djokovic complained of "sharp pain" in his knee during a quarter-final win over Stefanos Tsitsipas but did not appear bothered in Saturday's win.
While Alcaraz, who has four grand slam titles, beat Djokovic, who has 24, in their last meeting at Wimbledon, the pair have a 3-3 record in previous meetings.
The Serbian triumphed in their only meeting on the red clay of Roland Garros, in last year's French Open semi-finals.
Alcaraz, though, looms as a more likely champion, with 12 straight wins at the venue after this year's French Open crown.
The Spaniard has eschewed his superstar status to live in the Olympic village with other, mostly amateur, athletes during the tournament, making him a fan favourite.
"I have imagined it. I have thought about it and visualised it," Alcaraz said of Olympic gold.
"It is something that boosts my mood, that gives me energy to keep going forward, keep learning, and give all my best every day ... it is a special moment for me in my career and my life."
Zheng and Vekic, the world No.21, will meet on Sunday (AEST) after the Chinese world No.7 knocked out hot favourite Iga Swiatek in the semi-finals.
Swiatek rallied to win bronze, defeating Anna Karolina Schmiedlova of Slovakia 6-2 6-1 to claim Poland's first-ever Olympic tennis medal.
