The Italians dominated but Dickson Etuhu's away goal gives the Cottagers hope of overturning the deficit.
Under today's scoring system, that away goal would have seen Bangor progress to the next round.
BBC: Bangor City say farewell in style to Farrar Road ground
Chelsea needed an instant response, and Crespo provided it with the crucial away goal six minutes later.
BBC: SPORT | Football | Champions League | Monaco 3-1 Chelsea
Because of its away goal in the first leg, Real would progress with a 3-0 victory over Dortmund.
Dutch winger Robben scored the visitors' second away goal firing home from six yards in the 70th minute.
But Distin was sent off for upending Liedson inside the box and Veloso calmly slotted home an away goal.
Smith opted for just one player up front, Kenny Miller given the task of securing the vital away goal.
But Riise headed in Salomon Kalou's cross five minutes into injury time to give Chelsea a priceless away goal.
The miserable weather played a huge part in proceedings as Gordon Chisholm's side conceded an away goal inside two minutes.
But six minutes into extra-time, the previously quiet Emmanuel Adebayor silenced Inter's fans when poking home a vital away goal.
Gerrard refused to put any blame on Riise for his mistake that handed a vital away goal to the Blues.
And substitute Grishin ended those hopes as he slotted a volley beyond Fulham keeper Mark Schwarzer for a crucial away goal.
Guimaraes had other ideas, and began to push for an away goal that would have given the tie a very different balance.
And Sporting got the away goal they were searching for when Joao Pereira crossed for substitute Fernandez to head powerfully past McGregor.
But, as in the quarter-final with Sporting Lisbon, they will be pleased to have prevented their opponents from scoring an away goal.
Juventus appeared happy with their lead while Fulham, with an away goal in the bag, also seemed happy to shut up shop.
Algeria had gone an astonishing four years without an away goal in World Cup qualifiers, but their victory in Chililabombwe ended that unwanted statistic.
Hernan Crespo's close range strike gave Chelsea a crucial away goal when he swiftly levelled Dado Prso's header after 15 minutes in the semi-final.
BBC: SPORT | Football | Champions League | Monaco 3-1 Chelsea
Ramires also shot wide and an away goal seemed inevitable but Wolves were awoken from their slumbers by a very clumsy studs-up challenge by Lampard.
But Novo's 81st minute equaliser gave Rangers the priceless away goal.
However, midfielder Mumford's crucial away goal in Vilnius gives Llanelli some hope to take back to Carmarthen's Richmond Park on 1 July for the return leg.
Forlan scored a goal in both legs of his side's semi-final - the second an extra-time away goal - to end Liverpool's hopes of reaching the final.
Inter knew that vital away goal would leave Chelsea with a huge task, and Eto'o wasted a wonderful opportunity to provide it for them after 33 minutes.
The Bundesliga top scorer pounced on an error by Inter keeper Julio Cesar to tap home a priceless away goal in the first leg of the sides' last-16 clash.
Motherwell were given the opportunity to score an away goal in the 56th minute after Guga tugged Sutton's shirt in the box as Flamurtari tried to defend Hammell's free-kick.
The game followed a similar pattern after the break, with City fashioning the better chances and Aalborg committing plenty of men forward in the hope of snatching an away goal.
Queens' second-half performance didn't produce the outcome it deserved and the First Division side will now need to pull off a memorable performance in Denmark to overturn the away goal deficit.
The return leg will be at Anfield on 17 March and, although Braga coach Domingos Paciencia was happy his side did not concede an away goal, he remains wary of Liverpool.
It was United, however, who took the lead with a superbly constructed goal after 24 minutes as they delivered the away goal Ferguson had insisted upon in the build-up to the tie.
It did little to help the Spanish club and it was Liverpool who looked the more likely to score and take the crucial away goal back to Anfield for the second leg.
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