The UEFA Champions League semifinals get underway on Tuesday, Apr. 29 with Arsenal taking on Paris Saint-Germain for the second time this European campaign.

Three-quarters of the field might have finished second, third and fourth in the Champions League's league phase, but the team who had to scrabble in to the knockout playoffs on the final day are just as fancied as anyone else.

How does it work?Thirty-six sides entered into the new "league phase" and now just four remain with a month-and-a-half to go in the UCL campaign.Barcelona, Paris Saint-Germain, Arsenal, and Inter Milan are through to the semifinals,