I put quite a long shortlist down, so if you still have to take it upon yourself to disagree with someone I posted then get stuffed.

Thiago Silva - Core piece of Brazil's squad. Capitulated without their captain v Germany.
Mats Hummels - 2 goals. Absolutely stunning performances all around.
Giancarlo González - Helped Costa Rica to a stunning goal conceding record of 2 in 5 matches (v URU, ITA, ENG, GRE, NED).
Ron Vlaar - Who can
Daley Blind - tell these
Stefan de Vrij - guys apart?
Marcos Rojo - Strongest Argentine defender
Philipp Lahm - It's Philipp Lahm
Rafa Marquez - Mexico's best defender. Scored crucial goal v Costa Rica. Insane performance v. BRA, NED.
Dani Alves - Cocky **** **** **** shouldn't be here, but he's still appearing in a lot of tournament XIs.
Ezequiel Garay - Included by El Turco as a wild card.
Feel more than welcome to add your own if you like. There were a lot of people I could've added but limited to 10 in the poll creation