3 takeaways from Tuesday's Champions League action

The Champions League kicked off its second matchday with its unique blend of global superstars, minnows, and matches richer in content than Sam Allardyce's pockets following a sketchy meeting at Wing's restaurant in Manchester.

Borussia Dortmund's kids and Real Madrid's superstars played out a riveting encounter in North Rhine-Westphalia; Leicester City went back to basics in its 1-0 defeat of FC Porto; and Juventus finally overcame its profligacy in attack against an accommodating Dinamo Zagreb.

Here are three takeaways from Tuesday's contests:

Tuchel's youthful entertainers

There is a legitimate argument that Borussia Dortmund is currently the most exciting side to watch in Europe - and a club which certainly had an unrivalled summer transfer window.

The additions of Ousmane Dembele, Raphael Guerreiro, and Emre Mor have brought a youthful exuberance and positional fluidity to Thomas Tuchel's ranks amid many notable departures, forging one of the most unpredictable outfits in the game. Zinedine Zidane's preparations for Tuesday's tilt must've been an ordeal.

But Real Madrid, leaning on the experience of Cristiano Ronaldo and the quietly influential Toni Kroos, looked to be edging out a fortuitous victory at the Westfalenstadion. Dortmund recorded 10 shots on target against Los Blancos - just the fourth time in 10 seasons that the Spanish giant had conceded double figures on net in the Champions League - and would've been rightly aggrieved with a loss.

That was until Andre Schurrle stepped up on 87 minutes.

Related - Watch: Schurrle levels Madrid melee with left-footed missile

Schurrle's rocket, a player who at 25 is a relative old campaigner, earned a much-deserved point for Dortmund, leaving Real Madrid and Borussia's brood locked atop Group F with four points apiece.

Route-one Leicester returns

The Foxes managed to bite down on the trickery of Otavio et al. to ensure a historic win in the Champions League over FC Porto.

Related: Leicester sets English record with another Champions League victory

Daniel Amartey was a vital component for Leicester City in the middle of the park - alert, but unadventurous in forays forward - and the attacks, somewhat characteristically, were quickly dispatched and intended to be as destructive as possible: courtesy of hurled throw-ins from Luis Hernandez and hoisted set-pieces from Riyad Mahrez.

It was the latter delivery which fed Islam Slimani for his seventh goal in seven matches against Porto, continuing his free-scoring exploits from his days with former club Sporting Lisbon against the Dragons in Portugal.

The new boy offers what Leonardo Ulloa did before - but with much more potency and grace.

Two wins in two matches to begin Leicester's maiden Champions League adventure - perhaps Claudio Ranieri is bringing the Foxes' fairy tale to a continental audience this term.

The Old Lady finds her shooting boots

Rather predictably, Saturday's experiment with the portly Gonzalo Higuain and the ungainly Mario Mandzukic leading the attack didn't last long, and the inventive and nimble Paulo Dybala was welcomed back into the starting XI.

Juventus' first three strikes of the 4-0 rout of Zagreb were sublime, with Miralem Pjanic bagging a goal and an assist, and Higuain's propensity to feed on scraps up front with his teammates buzzing around him should mean domestic dominance and another late run into the Champions League.

The cobwebs from Juve's opening 0-0 draw with Sevilla were soon shaken off.

Goal of the Day: Thomas Delaney

Watch out, Porto, FC Copenhagen isn't content with third spot in Group G. The Danish club trounced a dour Club Brugge by a 4-0 scoreline, but it was Thomas Delaney who stole the show with this ferocious wallop. The Lions are now two points behind leader Leicester in the quartet, with Porto possessing just a solitary point.