EXCLUSIVE CONTENT Get ESPN+ X factor players for all 16 UCL teamsCesc Fabregas will play a key role -- both in the attack and on defense -- in Chelsea's Champions League title bid. IAN KINGTON/AFP/Getty ImagesAdrian Melville, ESPN InsiderCloseJoined ESPN in 2013 as a soccer Insider Worked previously at NBC, Major League Soccer and Opta (UK) Played college soccer at Princeton and professionally for the New England Revolution and Santo Andre, a second-division club in BrazilFollow on XFeb 17, 2015, 11:00 AM ETEmailThe knockout stage of the Champions League features a number of great matchups, and each of the 16 remaining teams will rely heavily on individual performances to advance to the later rounds.