Following some interesting results and surprise victories on the opening Champions League matchday, there are some particularly intriguing fixtures this week -- and some exciting individual matchups.
Here are four key battles that could prove crucial in deciding the outcome of the most interesting games:
Thiago Motta (PSG) vs. Sergio Busquets (Barcelona)
These two have history. Motta was sent off in the famous 2010 European Cup semifinal between Pep Guardiola's Barcelona and Jose Mourinho's Inter,...