Novak Djokovic and Carlos Alcaraz are firmly on course for a gold medal clash after they reached the quarter-finals at Roland Garros.
World No.1 Iga Swiatek is also through and on track for a maiden Olympic title.
And Australia's hopes of a first tennis gold since the Woodies in 1996 remain alive, with Matt Ebden and John Peers flying the flag in men's doubles.
In a dramatic day on the Parisian clay, Djokovic defied hot and humid conditions to claim a 7-5 6-3 victory against German Dominik Koepfer.
The Serbian is the first player in the modern era to reach the singles quarter-finals at four Olympics.
However, in a rare blemish of the 37-year-old's trophy-laden career, he has lost all three of his Olympic semi-finals.
"Bringing a medal to Serbia is always a big goal of mine, has been since my first Olympic Games in Beijing," he said.
"I had actually some really good Olympic Games but that semi-final hurdle was (too) tough for me to go through."
He will face Stefanos Tsitsipas for a place in the last four.
On the other half of the draw, Alcaraz became the youngest man since Djokovic in the Chinese capital to reach the last eight, beating Roman Safiullin 6-4 6-2.
The Spaniard will next play American Tommy Paul, a rematch of their Wimbledon quarter-final.
Reigning Olympic champion Alex Zverev is also through after beating the last Australian singles hope, Alexei Popyrin 7-5 6-3.
Popyrin, a former French Open junior champion, held a set point against the German before succumbing to the world No.4.
Australia has just one entry left at Roland Garros - Ebden and Peers - who won a tough quarter-final in two tiebreaks, besting Koepfer and Jan-Lennard Struff 7-6 (7-2) 7-6 (7-4).
Hours later, Ebden backed up with Ellen Perez and held two match points before falling to an agonising loss 6-7 (8-10) 7-6 (10-8) (10-5) to China's pairing Wang Xinyu and Zhang Zhizhen.
The men's pairing will be eager to win their semi and follow in the footsteps of Mark Woodforde and Todd Woodbridge, the only Australians to have played in an Olympic final.
Ash Barty and Peers claimed Australia's most recent tennis medal, bronze in Tokyo.
The Aussie team's next opponents could be the most high-profile in Paris: retiring great Andy Murray and Dan Evans, who play their quarter-final on Friday morning (AEST).
Rafael Nadal and Alcaraz won't be waiting on the other side of the draw the glamour pairing lost to American duo Austin Krajicek and Rajeev Ram.
In women's singles, Swiatek dropped her first set of the tournament but won through against a hurt Daniel Collins in their quarter-final.
Collins lost 6-1 2-6 4-1 due to a stomach injury and served it up to the world No.1 at the net after retiring, telling her not "to be insincere about the injury".
"There are a lot of people with a ton of charisma ... (who) are one way on camera and another way in the locker room," she said.
"I don’t need the fakeness."
Another retiring three-time grand slam champion, like Murray, Angelique Kerber suffered a heart-breaking 6-7 (4-7) 6-4 7-6 (8-6) loss to China's Zheng Qinwen in the quarter-finals of the women's singles.
The German is calling it quits at the age of 36 having returned to the tour earlier this year following the birth of daughter Liana.
Zheng is now guaranteed a medal shot, as is Slovakia's Anna-Karolina Schmiedlova, both semi-finalists.
