Ouf, that's bad luck indeed, but I think it truly depends on the whole match. Most likely the guy retired through injury right? And in the last set, if he was down 4-0, most likely because he was just injured and couldn't get all the balls. So the whole set could be considered void. It's bad luck but that's tennis for you. But good luck for your request anyway
Yeah, I don't know what happened to the player, but I guess he just accepted the defeat cause its 4-0 3rd set, and I also have to accept that I can't win this bet. lol I've already accepted the final decision by sportsbets.io on this bet. Steve already PMed me and discuss about how void bets on tennis works and I fully understand it now. Steve gave me another free bet since he think that I'm active on posting in this thread, also if the freebet is voided, it's not refundable its like consider as lost.
I'm fine with this now, at least I was given another freebet by Sportsbet.io/Steve and thanks to them, I got another one.
I'll now avoid betting my free bet on tennis. I learned a lot from this experience. Lol.