Youri Tielemans opened his Monaco account as last season's semi-finalists held RB Leipzig to a 1-1 draw to deny Ralph Hasenhuttl's side an historic victory on their Champions League bow.
The big-money signing from Anderlecht struck two minutes after Emil Forsberg scored his club's first goal in Europe's elite competition, with their first shot on target.
The 25-year-old timed his run to perfection to latch onto a ball down the left channel, before cutting into the penalty area and lashing the ball emphatically past Diego Benaglio with just over half an hour on the clock in this Group G encounter.
It was pure ecstasy for the newcomers, but their joy turned to sorrow only two minutes later when Monaco levelled, as Tielemans silenced the raucous home crowd when he capitalised on Peter Gulacsi’s fumble to tap in from close range.
Leipzig, founded in 2009, have enjoyed a rapid rise to the top of club football and, on this showing, Hasenhuttl's men proved they have the quality required to compete at this level.
The inexperienced hosts took their time to settle into the game initially and it was the visitors who created the first opportunity after seven minutes when Radamel Falcao's shot was blocked and Adama Diakhaby could not react quick enough to apply the finish.
Timo Werner has been Leipzig's standout player so far this season and he should have done better when Forsberg's corner delivery just evaded him at the back post.
The historic Leipzig goal finally came after 34 minutes, and in spectacular fashion. Forsberg was allowed to charge into the penalty area from the left channel before finishing emphatically past Benaglio.
But Monaco soon levelled as Tielemans silenced the raucous home crowd. Tielemans was at the back post to meet a superb right-wing cross, and though his first effort was blocked he was on hand to apply the finish from the rebound.
Leipzig ended the first half on a high and almost restored their lead when Lukas Klostermann's cross was inch-perfect for Werner, but Kamil Glik stepped in to make a crucial intervention.
The hosts started the second period on the front foot and when Werner - usually so prolific - broke into the box after 52 minutes, he was favourite to score. Agonisingly, he sent the ball inches wide of the post.
And just before the hour mark, Glik saved his goalkeeper's blushes when the Monaco defender cleared from the line after Benaglio had flapped at Forsberg's excellent corner delivery.
Leipzig's pressure was building and after 62 minutes, following a nice team move, Yussuf Poulsen had the ball in the back of the net, only for the goal to be ruled offside.
Benaglio had to be at his best to block Jean-Kevin Augustin's goal-bound effort in the latter stages as Leipzig had to settle for a point.
|Morata shining as Chelsea´s leading man after Juve, Madrid frustration|
|Guardiola baulks at Chelsea or United fearing in-form Manchester City|
|CAF Champions League Review: Etoile Sahel see off Al Ahli Tripoli to reach semi-finals|
|Brighton winner was a foul, claims frustrated Benitez|
|Spalletti: Unbeaten Inter must go beyond their limits|
|Brighton and Hove Albion 1 Newcastle United 0: Hemed the hero in second home win|
|Better late than never - Matuidi delighted with start to life at Juventus|
|Inter 1 Genoa 0: Late D´Ambrosio header snatches victory for Spalletti´s side|
|Delph a willing deputy for injured City left-back Mendy|
|Howedes ruled out for four weeks|
|Milan lacked determination and quality in Samp defeat - Montella|
|Sheffield Wednesday 2 Sheffield United 4: Clarke at the double in derby win|
|Uruguayan Primera Division fixtures cancelled amid referee strike|
|Mendy hoping to follow successful City season with World Cup triumph|
|Sampdoria 2 AC Milan 0: Duvan Zapata claims family bragging rights|
|Dybala backs dropped Higuain to rediscover clinical touch|
|21st century boy - Lyon youngster Geubbels makes Ligue 1 history|
|Napoli fear more knee surgery for Milik|
|Spalletti promises reaction from smarting Inter|
|Montella backs ´fired up´ AC Milan to ´raise the bar´|
|Meunier: PSG don´t have Neymar dependency|
|Pogba could have surgery on hamstring injury – surgeon|
|MLS Review: Shield-chasing Toronto beaten again, Union extinguish Fire|
|Allegri: Higuain needs to rediscover form after Juve axing|
|Juventus great Nedved comes out of retirement|
|I´ll be back! Schwarzenegger visits Barcelona|
|Are you on loan from Man City? Messi quizzes Girona´s Maffeo|
|CAF Champions League Review: Holders Sundowns out on penalties|
|Alba lauds Valverde´s impact at in-form Barcelona|
|Pjanic: Things will only get better for Juventus|
|Bosz points to collective effort despite Aubameyang & Philipp heroics|
|Juventus and Napoli make record-breaking Serie A start|
|Atletico have improved despite transfer ban, says Simeone|
|Championship Review: Pacesetters Leeds, Cardiff & Wolves battle to wins|
|Klopp: We are not the Harlem Globetrotters|
|Juventus 4 Torino 0: Dybala stars again in rampant derby victory|
|Girona 0 Barcelona 3: Centurion Suarez seals Catalan derby triumph|
|He´s been brilliant – Henderson delighted with Coutinho contribution|
|Klopp sees flawed performance at Leicester as typical of Liverpool|
|Benteke knee injury piles more woe on Palace|
|Emery angry at failure to give PSG ´very clear´ penalty|
|Llorente agrees new four-year Real Madrid deal|
|Ronaldo relaxed despite goalscoring woes, says Zidane|
|Dyche demands rule change after Van La Parra dive|
|Borussia Dortmund 6 Borussia Monchengladbach 1: Aubameyang hat-trick inspires Dortmund rout|
|Sane´s simple stuff delights Guardiola after poor pre-season|
|Leicester City 2 Liverpool 3: Classy Coutinho helps to halt Reds slump|
|Manchester United to take action after Lukaku chants resurface|
|Clement shoulders blame as Swansea´s home woes continue|
|18 shots, zero goals - why Cristiano Ronaldo is LaLiga´s most frustrated player|
|Like Barca without Messi or Madrid without Ronaldo – Verratti insists Neymar-less PSG are still grea|
|Chelsea star Morata must continue scintillating form – Conte|
|Mourinho hails ´amazing´ Manchester United fans despite reprisal of Lukaku song|
|Caixinha stands by ´loud and clear´ Old Firm row with Brown|
|Relieved Koeman hails ´incredible´ Niasse|
|The boys were not sharp – Mourinho concedes United had to go defensive at Southampton|
|Montpellier 0 Paris Saint-Germain 0: 100 per cent record ends in Neymar´s absence|
|Five-star Manchester City on best top-flight goal run since 1950s|
|Swansea 1 Watford 2: Late Richarlison strike secures victory for Silva´s side|
|Deportivo Alaves 1 Real Madrid 2: Ceballos off the mark as champions bounce back|
|Burnley 0 Huddersfield Town 0: Spoils shared after uninspired arm-wrestle|
|Everton 2 Bournemouth 1: Niasse double relieves pressure on Koeman|
|Manchester City 5 Crystal Palace 0: Guardiola´s men sink strugglers to go top|
|Southampton 0 Manchester United 1: Lukaku strikes again in unconvincing victory|
|Stoke City 0 Chelsea 4: Magic Morata hits hat-trick|
|Kane one of the best, Bilic says|
|Manchester United fans sing Lukaku chant in defiance of warnings|
|I am in love with him! - Pochettino praises derby hero Kane|
|Two-goal Kane surpasses 19 Premier League teams for shots against the woodwork|
|West Ham 2 Tottenham 3: Kane at the double to play derby hero again|
|Pulis regrets comments on Livermore´s West Brom absence|
|Rangers 0 Celtic 2: Rogic and Griffiths maintain Old Firm dominance|
|Atletico Madrid 2 Sevilla 0: Carrasco, Griezmann send Simeone´s side second|
|Ulreich shoulders blame as Bayern colleagues rally around stand-in keeper|
|Go **** yourselves - Wright blasts Arsenal fans after Oxlade-Chamberlain backlash|
|Falcao revels in career-best streak|
|De Bruyne, a drug test and a lot of questions - Mendy reveals origin of Man City move|
|Benevento blame captain Lucioni´s failed doping test on cream|
|Ibrahimovic stamp was an accident – Mings|
|Carroll must stay fit to earn new West Ham deal, says Bilic|
|Mourinho: Every Man United forward deserves to start|
|Salah better than expected at Liverpool – Klopp|
|Wenger: Something will happen to regulate transfer fees|
|Mourinho warns Shaw to work hard to regain Manchester United place|
|Ancelotti slams ´slow´ Bayern after Wolfsburg fightback|