It is official. It will be Brazil vs. Mexico for the WTO DG's position. The WTO website announced the last lap here.
"Therefore, we will begin the third and final round of consultations based on a revised slate of two candidates, again in the order in which their nominations were received, as follows:
— Mr Herminio Blanco (Mexico)
— Mr Roberto Carvalho de Azevêdo (Brazil)"
One is tempted to compare the football record of the two countries - though that may not have any bearing on the result here.