Chelsea secured a Champions League semi-final berth with a 2-0 win over PSG on Tuesday night as they overturned a 3-1 first-leg deficit to progress to the next round on the away goals rule thanks to Demba Ba's late strike.
The much-maligned frontman stepped off the bench to rubberstamp his side's place in the final four after Andre Schürrle had halved the Parisiens' lead with a first-half opener.
Here are the five things we learned from Chelsea's impressive win...
Willian the man for the big occasion
When Eden Hazard's evening succumbed to a calf injury, the onus was on the remaining members of the Chelsea attacking cavalry to take the game to the French side and find the elusive goals required to pave a way through to the semis.
While Oscar was perhaps expected to be the creator-in-chief in Hazard's absence, it was Willian who shone most brightly on his right-wing station, dovetailing beautifully with his fellow attackers and combining his flair up the field with a desire to defend from the front.
His industry and general work ethic were paramount to Chelsea's success, with Branislav Ivanovic particularly grateful for the Brazilian's ability to track back, rob the likes of Ezequiel Lavezzi of possession and launch counter attacks. If Ba and Schürrle were the architects of the Blues' win, Willian was the heartbeat of it.
Life in the old dogs yet
Chelsea have retained the same core, albeit without a certain Didier Drogba, that saw Jose Mourinho claim his first titles in English football at Stamford Bridge, with Petr Cech, John Terry and Frank Lampard all proving worthy of starting XI places on Tuesday as they fought courageously to ensure their side's progress.
Cech's contribution was far from minimal either. The No.1 showed superb reflexes to tip aside Lavezzi's free-kick and went one better to deny Marquinhos what would have been a winning goal, in terms of the tie at least, in the dying seconds.
Terry was at his imperious best in defence, winning every header and challenge that needed to be made in the face of concerted PSG pressure, albeit pressure that was intermittent at best. Lampard provided a combative edge in midfield prior to being sacrificed for Ba and was key in driving his side on from his quarter-back role in the engine room.
Chelsea so much more than a one-man team
There have been suggestions, as Chelsea have shown signs of faltering in the title race, that the Blues cannot cope with the pressure of expectation on their shoulders when Hazard fails to fire.
Ironically, the Belgian has not scored from open play since his stunning second goal as part of his hat-trick against Newcastle United way back at the start of February but recent defeats at Aston Villa and Crystal Palace have shown a frailty and perhaps over-reliance on the much-vaunted Hazard in attack.
The win against PSG provided evidence to the contrary as Hazard departed the scene early due to a calf injury. Schürrle was the man to take centre stage, scoring and going close with a strike that hit the bar, while Willian and Oscar also did their utmost to refute the suggestion that Chelsea simply cannot cope in their star man's absence.
Ba still has a future under Mourinho
The fact the Blues chief elected to bring on Ba ahead of Fernando Torres in the first place spoke volumes; both of Torres' sad decline and also his current standing in the squad, which now appears to be a clear third choice.
With Ba stealing all the plaudits with his late intervention and Samuel Eto'o's fitness gambled on by Mourinho to prevent Torres from starting it is clear the Spaniard is on his way out. His apparent lack of celebration at the final whistle was indicative of a player who knows his future lies elsewhere.
Ba, though, revelled in Chelsea's need for a second goal and duly seized his chance. With news Mourinho will have to balance the books with the potential sale of Hazard or Oscar for Roman Abramovich to countenance a deal for the likes of Diego Costa, Mourinho can ill-afford to rid of his entire strikeforce but the futures of Torres and Romelu Lukaku - on loan at Everton appear bleak at best.
Eto'o may yet be handed another crack at a season in England but Ba's future had previously been up for debate. Tuesday's vital contribution may have swayed it back in his favour.
Cavani fails to hit the right notes
Two chances in front of goal and both, with differing degrees of profligacy, were passed up. It simply was not Edinson Cavani's night as he desperately sought to pass his audition for the central striking role which has been monopolised by Zlatan Ibrahimovic ever since the Uruguayan's big-money arrival.
He has expressed frustration at having to operate on the flanks in Laurent Blanc's 4-2-3-1 system but, judging by Tuesday night's performance, he may have to get used to limited outings at the tip of the PSG attack.
His first was difficult, as he looked to catch Cech by surprise with an early shot but his second was inexcusable. Substitute Yohan Cabaye picked him out with a stunning long ball and, having brought it into his path, he should have done much better than to blaze high into the stands.
Considering the £55m the Ligue 1 outfit paid for him, PSG are entitled to expect more.