Originally Posted by SystemicAnomaly
I came across a tennis science paper for high performance player development from the USTA some years ago on this very subject. I posted links to it in several threads in the past few years. It indicated that an elite singles player remained in the aerobic training zone for most of a match. About 40-60% of their energy needs comes from the aerobic system while the rest comes from 2 different anaerobic systems.
Is this the link from one of your old posts? See page 40 -