Teenage striker Gabriel Martinelli scored two goals and set up another to give Arsenal victory over Standard Liege in the Europa League.
There was less than three minutes between the 18-year-old Brazilian’s first and second goals while team-mate Joe Willock, 20, made it 3-0 before half-time.
Martinelli, who joined for £6m this summer, later set up Dani Ceballos for his first Arsenal goal.
Arsenal sit top of Group F with two wins from two games.
There were 10 changes to the Arsenal team who drew with Manchester United in the Premier League on Monday but no place in the squad for German midfielder Mesut Ozil.
Instead, manager Unai Emery put faith in the likes of academy graduate Willock, Martinelli and 19-year-old Reiss Nelson – as well as summer signing Kieran Tierney, making just his second start for the club.
All four impressed as Tierney set up Martinelli’s first with a whipping cross from the left before teeing up Nelson’s shot in the build-up to Willock’s goal.
Nelson recorded an assist – feeding Martinelli for his second – before slipping in the Brazilian to tee up Ceballos’ goal in the second half.
It could easily have been more for the Gunners on a very positive night which also saw full-back Hector Bellerin, captain for the night, make his first start in over nine months following a knee injury.
Martinelli was already a fan favourite after he became the youngest player since Alex Oxlade-Chamberlain in 2011 to score on his first start for Arsenal, against Nottingham Forest in the Carabao Cup.
Two goals in that 5-0 win was the perfect way for the summer signing to announce himself and every time he got on the ball at the Emirates on Thursday the crowd grew excited.
The teenager spent last season playing in the fourth tier of the Brazilian Football League with Ituano but his quality was evident against Standard Liege and he has now bagged four goals after just two starts for the club.
His first of the night was exceptional – a perfectly-timed header at the near post which flew past goalkeeper Vanja Milinkovic-Savic – while his second was equally impressive, cutting on to his right foot and drilling the ball into the far corner.
Both goals drew a smile from Pierre-Emerick Aubameyang on the Arsenal bench, and if the Gabonese striker had not scored seven goals in as many Premier League appearances this season, there may be a case for Martinelli to start more often.
The young Brazilian capped off an impressive night with an excellent assist – showing pace to reach Nelson’s pass before coolly lifting it over the goalkeeper and on a plate for Ceballos to tap in.
Full UEFA Europa League group stage results on Thursday:
Group A
Sevilla (ESP) 1 (Hernandez 17) APOEL Nicosia (CYP) 0
Dudelange (LUX) 1 (Bernier 90) Qarabag (AZE) 4 (Zoubir 11, Michel 30, Almeida 37-pen, Quintana 69)
Group B
Malmo (SWE) 1 (Rosenberg 55) FC Copenhagen (DEN) 1 (Nielsen 45+5-og)
Lugano (SUI) 0 Dynamo Kiev (UKR) 0
Group C
Trabzonspor (TUR) 2 (Parmak 26, Sosa 78) Basel (SUI) 2 (Widmer 20, Cabral 80)
Krasnodar (RUS) 1 (Ari 69) Getafe (ESP) 2 (Angel 36, 61)
Group D
Sporting Lisbon (POR) 2 (Phellype 58, Fernandes 63) LASK Linz (AUT) 1 (Raguz 16)
Rosenborg (NOR) 1 (Adegbenro 70) PSV Eindhoven (NED) 4 (Rosario 14, Meling 37-og, Malen 41, 78)
Group E
Celtic (SCO) 2 (Edouard 20, Elyounoussi 59) CFR Cluj (ROU) 0
Lazio (ITA) 2 (Milinkovic-Savic 64, Immobile 75) Rennes (FRA) 1 (Morel 55)
Group F
Arsenal (ENG) 4 (Martinelli 13, 16, Willock 22, Ceballos 57) Standard Liege (BEL) 0
Vitoria Guimaraes (POR) 0 Eintracht Frankfurt (GER) 1 (N’Dicka 36)
Group G
Young Boys (SUI) 2 (Assale 50, Fassnacht 90+3) Rangers (SCO) 1 (Morelos 44)
Feyenoord (NED) 2 (Toornstra 49, Karsdorp 80) Porto (POR) 0
Group H
CSKA Moscow (RUS) 0 Espanyol (ESP) 2 (Wu 64, Campuzano 90+5)
Ferencvaros (HUN) 0 Ludogorets (BUL) 3 (Lukoki 1, Forster 40, 64)
Group I
Saint-Etienne (FRA) 1 (Kolodziecziak 13) Wolfsburg (GER) 1 (William 15)
Olexandriya (UKR) 1 (Sitalo 60) Gent (BEL) 1 (Depoitre 6)
Group J
Istanbul Basaksehir (TUR) 1 (Visca 55) Borussia Moechengladbach (GER) 1 (Herrmann 90+1)
Wolfsberg (AUT) 1 (Liendl 51) Roma (ITA) 1 (Spinazzola 27)
Group K
Besiktas (TUR) 0 Wolves (ENG) 1 (Boly 90+3)
Sporting Braga (POR) 2 (Viana 31, Galeno 63) Slovan Bratislava (SVK) 2 (Sporar 45+4, Viana 87-og)
Group L
Astana (KAZ) 1 (Sigurjonsson 85) Partizan Belgrade (SRB) 2 (Sadiq 29, 73)
AZ Alkmaar (NED) 0 Manchester United (ENG) 0
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