Buyer has opened a "defective item" return request when the item is not defective

I sell Region 1 DVDs.   All of my items are clearly advertised as Region 1 DVDs in several places throughout my item description.

One of my buyers has purchased a DVD without reading the item description.  The DVD is not compatible with his DVD player.  he buyer has not opened a return request claiming that the DVD is defective.  The DVD is not defective, the buyer just didn't read the description.   It seems it is my responsibility as a seller to pay for the return postage for the DVD to be returned.

I plan on challenging this, however I don't know what my chances are.  Does anyone have any advise for me on this?  Does ebay ever close return requests in the favour of the seller?