It is incredible how time flies. Approximately ten years ago, Arsenal and Barcelona squared off in the UEFA Champions League final in Paris. That was a great day (thank you Henrik Larsson and Juliano Belletti) and hopefully we see much more of the same over the upcoming 2 legs of Last 16 play. Since that day in May 2006, there have been many matches between these two sides, with protagonists on both sides creating some brilliant highlight moments. From the feted MSN triumvirate to Zlatan Ibrahimoviu0107 in 2010 or a familiar face in Alexis Sánchez, there will be some key battles to keep an eye on today.