Endrick scored his first Real Madrid goal as Carlo Ancelotti's side claimed their first win of the LaLiga season after beating Real Valladolid 3-0.
Federico Valverde and Brahim Diaz were also on target for Los Blancos, who struck three times in the second half despite a generally lacklustre display at Santiago Bernabeu.
After a goalless first half, Madrid broke the deadlock within five minutes of the restart, as Valverde thumping a vicious 25-yard free-kick through the Valladolid wall and beyond goalkeeper Karl Hein.
The reigning LaLiga champions had to wait until the 88th minute to establish breathing space with substitute Diaz latching onto Eder Militao's long ball and slotting home.
Endrick, who also climbed off the bench, added gloss to the scoreline deep when he rounded off a swift counter in the sixth minute of stoppage time.
The teenage dream comes true for Endrick
Entering the contest as an 86th-minute substitute, Endrick took just 10 minutes to announce himself to Santiago Bernabeu with his new side's third goal.
At 18 years and 35 days old, the Brazil international became the youngest Madrid player to score on his LaLiga debut in the 21st century, and the first foreign player to achieve the feat overall.
His effort was provided by Diaz, who scored and assisted in a single match in any competition across Europe's top five leagues as a substitute for the first time in his career (207 appearances).
Los Blancos have now won each of their last six league meetings with Valladolid without conceding, while their opponents have lost on four successive trips to the Spanish capital for the first time since a run of six in November 2012.
Girona 4-1 Espanyol: Miovski bags double as hosts ride on first-half blitz
Bojan Miovski scored twice as Girona thrashed Espanyol 4-1 in LaLiga at Estadi Municipal de Montilivi on Saturday.
Bryan Gil and Ladislav Krejci were also on the scoresheet as the home side raced to a 4-0 lead inside the first half hour, with Javi Puado scoring the visiting side's only goal after the break.
After the match was halted because of a fan being taken ill in the crowd, Gil opened the scoring when he unleashed a stunning long-range strike into the bottom corner with four minutes on the clock.
Gil was behind the second goal for Michel's side too, as he capitalised on a defensive error and crossed to Miovski, who made it 2-0 in the 16th minute before the pair combined again for a third five minutes later.
Donny van de Beek's header from Yaser Asprilla's corner was pushed in by Krejci for Girona's fourth in the 27th minute.
Espanyol got a consolation goal 10 minutes into the second half when Puado hit a long-range strike that found the back of Paulo Gazzaniga's net.
Girona, last season's surprise package, climbed to fifth in LaLiga with 21 points, while Espanyol are 19th and in the relegation zone with 10 points.
Milan 0-0 Juventus: Bianconeri maintain unbeaten start after Rossoneri stalemate
Milan and Juventus shared the spoils following a dour goalless draw at San Siro.
The Bianconeri maintained their unbeaten start to the Serie A season, but missed the chance to go second behind leaders Inter after a game lacking in quality and chances.
With the likes of Dusan Vlahovic and Arkadiusz Milik out injured, Juventus began the game without a recognised striker, as Teun Koopmeiners and Weston McKennie led the line.
Koopmeiners hit the side-netting from a tight angle after 10 minutes, while Kenan Yildiz grazed the post following a fine individual run midway through the half.
Alvaro Morata had Milan's best chance at the other end, but the former Juventus striker could only head wide from Rafael Leao's free-kick.
Opportunities did not fall as freely in the second half either, and both teams left the field to a chorus of boos on the referee's final whistle.
Data Debrief: Stubborn Juve take clean sheet tally into double figures
Juve are the first team to register 10 clean sheets in their opening 13 matches of a Serie A season since Roma (also 10) in 2013-14.
The Bianconeri have also kept five clean sheets in their first six away league games in a campaign for only the fourth time, also achieving the feat in 1967-68, 2004-05, 2023-24.
Meanwhile, Thiago Motta is only the fifth Juventus manager to go unbeaten in his first 13 league matches in charge (won six, drawn seven), after Jesse Carver, Cestmir Vycpalek, Antonio Conte and Maurizio Sarri.
'I love where I am,' says Simeone after 700th game in charge of Atletico
Diego Simeone said he is "calm and at peace" at Atletico Madrid after his side edged Deportivo Alaves 2-1 in LaLiga in his 700th game in charge of the club.
Atletico went behind through a Jon Guridi penalty in the seventh minute, but Antoine Griezmann drew them level from the spot in the 76th minute.
The winner came via Alexander Sorloth in the 86th minute as Atletico moved four points behind leaders Barcelona.
Simeone, who has been in charge of Atletico since 2011, is the first coach to manage 700 matches with the same LaLiga club.
"I live in the present, we are having a good time, the boys are working very responsibly," Simeone told DAZN.
"I am calm and at peace. I love where I am and that's it."
He managed Atletico to LaLiga title triumphs in 2014 and 2021 and also helped Los Rojiblancos win two Europa League titles in 2012 and 2018.
The game against Alaves was Simeone's 492nd LaLiga match in charge, and the Argentine has also managed the third-most games with a single club in the Champions League (109), after Alex Ferguson with Manchester United and Arsene Wenger at Arsenal.
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