First half: Roma 0-0 Porto
12:. 16  Preamble  Ciao The last stages of the Champions League: a fun place to stay if you are not one of the super clubs. Impacts are rare in this competition and unpredictability is limited. If you do not have hundreds of millions to throw around every summer, you can probably forget to win it. If you do not have elite players, history suggests that there is only so far that you can go.
But it's a knockout competition, so you never know, and both sides think they have a good chance of making the fourth-final. After finishing second in their group, Roma must be relieved that they have never landed one of your Barcelonas or your Bayern Monaco or your PSGS. After finishing first, Porto must be quite happy to have avoided your Liverpool, your Atletico Madrids, your Manchester United. He is about to play at the Olympic Stadium tonight!
And it is also very difficult to call. Trying to choose a favorite is not easy. Porto, at the head of the Portuguese championship from a point and unbeaten from October, will be happy to have the return home race and Sergio Concecaio will feel confident to have enough experience and firepower available to reach the knockout stages. But while Rome is experiencing a sticky season on a national level – Eusebio Di Francesco's team is sixth in Serie A after a series of inconsistent results and lost 7-1 against Fiorentina in the Italian Cup last month – Italians have eliminated the Barcelona about to reach the last four of last season and should represent a step forward in the class for Porto, which has passed a group containing Galatasaray, Lokomotiv Moscow and Schalke. In conclusion: everything could happen. Which is just as it should be.
Kick-off: 20:00 GMT, 21:00 in Rome.