Anand - Short (the battle of Kasparov WC match opponents without a "K" surname)
Nakamura - van Wely (the king of ICC against ICC's KingLoek)
Carlsen - Smeets
Ivanchuk - Tiviakov
Shirov - Caruana
Kramnik - Leko (the battle of former world championship match opponents)
Karjakin - Dominguez (another rematch: their last round game decided the 2009 tournament for Karjakin)