You do realise the difference between now and 2033 is the same as the difference between now and 1991.
The game will be more or less the same, with more spin/power. Strings will offer more of both with the same control, frames will get even lighter.
The biggest change, the pros will be even fitter - Djokovic/Murray/Nadal levels of fitness will be standard for the top 100 or so.
Netplay and faster courts might come back into fashion to make up for the ridiculous level of fitness.
Most importantly though:
Head will release the Radical ElectoSponge, with more power and less shock.
Wilson will release the Federer Retro Tour 90 through tennis warehouse
A poor man's right handed Verdasco (Wilson Prostaff 95s /w SPPP@50lbs)