Apparently, 'hold the mayo' is no longer a part of Americans' vocabulary

Ketchup isn’t the king of American condiments. Mayonnaise is. (Quartz, 1/29/2014)

(Update: Various readers have asked why salsa isn’t included on this list. Euromonitor responds that salsa is, technically speaking, a “dip”, not a condiment. So now you know. For what it’s worth, salsa would eclipse ketchup, but still be second to mayo.)