Sure, but their logo is still on their product even if they do sell clothing commercially. So why is it OK for Tommy to just buy their clothing and wear it in front of thousands of people without being sponsored, when Baghdatis still has to use a blank racket?
Because Nike has no problem with free exposure. Most clothing companies don't, they would be very stupid to do so for reasons that are pretty logical if you give it a second of thought. Only in cases of limited edition articles or some sort of special articles do they go to that extent and even in that case I'm sure it's just a matter of time and exclusivity if anything.
Obviously the racket manufacturer in question thinks differently. And making rackets is not the same as making clothes.
If the player in question has a problem with not getting paid while exposing in front of thousands of people then I guess he can just suck it up and wear plain t-shirts.