As of this morning the USD/MXN is around the 17.45425 ratio with fast changes of value being displayed as full volume is awaited on after the May 1st banking holiday in Mexico.
The USD/ZAR is near the 16.62430 ratio as of this writing, this after touching an early morning low around the 16.50000 vicinity when trading began, but caution has been sparked again and thus the reversal higher.