Giannis Antetokounmpo finished with 27 points but could not lead Greece to victory as they lost 84-77 to Spain at the Paris Olympics.
Two-time NBA MVP Antetokounmpo was the driving force behind Greece qualifying for the Games, but they are on the brink of an early exit after suffering their second defeat in Group A.
Antetokounmpo was in fine form, adding 11 rebounds to his tally, but Spain, who also lost their opening game, just had too much.
Spain were inspired by Memphis Grizzlies forward Santi Aldama, who registered 19 points and 12 rebounds.
They are up to third in the group, and will face table-topping Canada in their next fixture. Greece, on the other hand, must now beat Australia to stand a chance of progressing and keeping Antetokounmpo's Olympic dream alive.
In Tuesday's other Group A game, Canada overcame Australia 93-83, with R.J. Barrett of the Toronto Raptors scoring 24 points.
Swiatek eases to Paris Olympics quarter-finals
Iga Swiatek eased to the quarter-finals of the Paris Olympics as she beat Wang Xiyu in straight sets.
Swiatek, who has claimed four grand slam titles on the clay surface at Roland-Garros, continued her dominance on Tuesday as she emerged a 6-3 6-4 victor.
Wang started the match confidently, moving the world number one around the court early on, but Swiatek found her rhythm, earning a decisive break point in the sixth game before cruising to the first set.
The top seed managed to find a break in the opening game of the second set, but that lead proved difficult to maintain as Wang broke back instantly to take the next two games on the spin.
Swiatek, however, broke for a 3-2 lead and held her serve in the following game, but Wang continued to put on the pressure, winning her next two games to level the game.
The Pole would find yet another break of serve in the ninth game and was able to hold out to secure her passage to the quarter-finals in the French capital.
Swiatek will face Danielle Collins in the next round.
Data Debrief: Swiatek fights off inspired Wang
While the scoreline looked comfortable for Swiatek, it was far from it on Court Philippe-Chatrier.
In the opening set, Swiatek had 11 unforced errors compared to Wang's eight, while also hitting only nine winners.
But in a game filled with break points, Swiatek showcased her ruthless streak, converting four and saving six of the eight she faced.
Alcaraz and Nadal survive scare to reach Olympics doubles quarter-finals
Rafael Nadal and Carlos Alcaraz survived a scare to keep their quest for gold alive as they advanced to the quarter-finals of the Paris Olympics.
The Spanish duo were pushed all the way by Dutch pairing Tallon Griekspoor and Wesley Koolhof, but emerged 6-4 6-6 (2-7) 10-2 victors on Court Suzanne-Lenglen.
Nadal exited the singles following a defeat to long-time rival Novak Djokovic, but started impressively as the pairs exchanged rallies in the opening exchanges.
But a break in the seventh game for the Spaniards saw them assume full control of the first set, with Alcaraz serving out the final game to hold the early advantage.
However, Griekspoor and Koolhof would respond, with the Dutch pair able to dominate a second-set tiebreak, taking the encounter to an exciting conclusion.
But Nadal and Alcaraz would roar to victory, securing their passage to the next stage in the deciding third set after Griekspoor slammed an Alcaraz serve into the net.
Next up for the all-star Spanish duo is a clash with fourth-seeded Americans Rajeev Ram and Austin Krajicek.
Data Debrief: Nadalcaraz continue to shine
The combination of youth and experience worked to its full effect at Roland-Garros, with Nadal and Alcaraz once again showing their gold medal credentials.
Nadal and Alcaraz saved all three of the break points they faced, ending the contest by winning 81% of their first serve points.
Ukraine 0-2 Argentina: Almada and Echeverri on target but Albiceleste forced to settle for second in Group B
Thiago Almada and Claudio Echeverri helped Argentina secure a 2-0 win over Ukraine, but were forced to settle for second place in Group B at the Paris Olympics.
Argentina were among the pre-tournament favourites to win a third gold medal, and their individual quality in the final third ultimately shone through in Lyon.
In a first half that saw just two shots on target, Argentina struck just two minutes after the break as Almada sent a curling effort beyond the grasp of Kiril Fesiun.
Ukraine threatened to snatch a point in the closing stages, but Echeverri secured the win in the first minute of injury time as he was quickest to react to Kevin Zenon's spilled effort.
But in the other game in Group B, Morocco swept aside Iraq as they emerged 3-0 victors, notching six points from their three games to top the group ahead of Javier Mascherano's side.
Argentina will face the winners of Group A in the last 16, which will be one of France, New Zealand or the United States.
Data Debrief: Argentina's individual quality the difference
Almada's stunning strike came with an expected goals (xG) of 0.03, once again showcasing his quality that has seen him shine for Atlanta United in the MLS this season.
Despite being the tournament's oldest player, Nicolas Otamendi showcased his experience at the back to help Argentina secure the victory.
The 36-year-old had the most touches (96), more accurate passes (85) and highest pass accuracy (97.7%) than anyone on the pitch.
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