Kiliann Sildillia's second-half goal helped France continue their perfect start to the Olympic Games as they booked a place in the quarter-finals with a game to spare.
Les Bleus made it two wins from two thanks to the right-back's header, though they rode their luck against a spirited Guinea side, who had two first-half goals disallowed.
Amadou Diawara forced Guillaume Restes into a superb fingertip save just minutes into the tie before Jean-Philippe Mateta wasted a hat-trick of chances to put the hosts ahead.
A cheeky backheel dribbled wide, and a thumping header missed the target on either side of Soumaila Sylla's smothering save.
Naby Keita clinically picked out the bottom corner from an offside position just before half-time, with Abdoulaye Toure also seeing a goal ruled out moments later after meeting a free-kick.
France came to life in the second half and gave a warning sign when Loic Bade struck the post from a tight angle.
In the end, Sildillia proved the difference as he was left unmarked to meet Michael Olise's cross, and Sylla could not get to his thumping header.
France are through to the next round, and top Group A with six points, while Guinea sit bottom of the group having lost both of their matches so far.
Data Debrief: Les Bleus leave it late
For much of the first half in this game, France were sluggish and could have easily gone into half-time 2-0 down if it was not for two tight offside calls.
In the end, Thierry Henry's side showed their quality, with Olise proving the key man. He created six chances, more than anyone else on the pitch, with one of those resulting in an assist.
It is the first time France have reached the quarter-finals at the Olympics since 1996, as they looked to end a 40-year wait for a gold medal in the event.
Chelsea 1-4 Celtic: Ruthless Bhoys brush Maresca's men aside
A ruthless Celtic brushed aside Chelsea in a 4-1 thrashing at Notre Dame Stadium on Saturday.
The Scottish champions scored twice in either half before Christopher Nkunku's consolation, with Enzo Maresca still without a win after his first two friendly games in charge of the Blues.
Matt O'Riley, who is being heavily linked with a move away from Celtic, put the Bhoys in front after 19 minutes before setting up Kyogo Furuhashi for a close-range tap-in just after the half-hour mark.
Kasper Schmeichel proved the difference for Celtic, making a string of fine saves in the first half to protect his clean sheet, though he got lucky as Raheem Sterling and Marc Guiu both struck the woodwork after the break.
Despite signs of life from Chelsea, they were masters of their own downfall for the third goal – Benoit Badiashile's loose pass out from the back went straight to Luis Palma, who pounced on the chance.
The Honduran then set fellow substitute Mikey Johnston up for a deft finish just three minutes later, though Chelsea salvaged some pride late on as Nkunku beat Vijami Sinisalo with an emphatic penalty, but it was too little, too late.
Data Debrief: Problems to solve for Maresca
While the scoreline certainly paints a picture of dominance by Celtic, the stats show that Chelsea matched their opponents out on the pitch, but lacked just one thing - a clinical edge.
The Blues created 23 chances, nine more than Celtic, and had 10 shots on target, though an inspired performance from Schmeichel certainly did not help.
As for Celtic, they round off their pre-season tour having scored four goals in both of their last two matches, having beaten Premier League champions Manchester City 4-3 earlier this week.
Osaka crashes out in Olympics first round to fierce Kerber
Angelique Kerber breezed into the second round at the Paris Olympic Games with a straight-sets win over Naomi Osaka.
In her final tournament, the German kept her hopes of going out on a high alive, getting a 7-5 6-3 victory in just 69 minutes at the end of a rainy opening day at Roland Garros.
Osaka started strongly, racing into a 3-1 lead, but Kerber fought back and eventually got the vital break in the penultimate game of the set to edge in front.
The two were evenly matched again at the start of the second, but Osaka struggled to maintain her high level and lost her serve twice at the end as Kerber's four-game winning run carried her over the line.
Kerber will now face Jaqueline Cristian of Romania in the second round.
Data Debrief: Going for gold
Kerber won a silver medal in singles at Rio 2016, and she is looking to sign off her glittering career by going one better in Paris.
She asserted her dominance in the second set, particularly, winning 13 of 14 points when she got her first delivery into play.
Kerber also bows out holding a 5-2 head-to-head record over Osaka, who once again struggled on clay.
Onana: Man Utd made right decision by keeping Ten Hag
Andre Onana believes Manchester United made the right decision to keep Erik ten Hag as their manager despite a difficult second season in charge.
Ten Hag's future was the subject of rife speculation in the second half of the season as United slumped to their worst-ever finish in the Premier League, ending the campaign in eighth.
However, the Red Devils finished the campaign on a high by beating Manchester City 2-1 to lift the FA Cup, booking a place in the Europa League after missing out on the European places due to their league finish.
The Dutchman also lifted the EFL Cup in his first season in charge, while his Premier League win percentage of 54% (41/76) is better only by Alex Ferguson (65%).
Ten Hag penned a contract extension earlier this month, and Onana, who also played under him at Ajax, believes it was the right choice to keep him.
"I'm not the one who decides if the manager stays or not," Onana told Sky Sports. "We had a difficult season with Erik last year, but we ended really good.
"The club made the right decision.
"Me, as a player, I think I'm talking on behalf of all of us, we follow the instruction of the manager. We are with him 100%."
United are currently on a pre-season tour of the USA, with the first of their three games being played against Arsenal in Los Angeles on Saturday.
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