Finally someone is getting a grasp of this... Justin, you keep saying "why fake to loose" - no one says that. That's not the point. Not from Marin, not from the people here debating you.
Point is, during the match, Marin don't know if LXR is exaggerating her injury (faking it), to get a break, some interruption, take the tempo down, etc. You see this in all sports - players hurt themselves (they really do), then they exaggerate the injury to get some advantage before they go back and all of a sudden play full strength.
Now DURING the match, Carolina says, she had decided to play as if nothing had happened to LXR, because she never would know (at that point in time), if the injury was real or vastly exaggerated (perhaps even faking it). I think you should not read it as completely faking it (as in having no injury or not hurting the least), and read it more as exaggerate it to gain an advantage (eg. actually having hurt herself, then faking the extend of the injury for a short time).
And MeisterTim / Renbo have a valid point, that faking such injury during play, is seen more often than not,
and is used not to loose on purpose but to win (by gaining an advantage through the interruption/break caused by it, and perhaps even gaining an advantage from the opponent thinking that she's winning / relaxing a bit for a couple of rallies.
You can be absolutely sure, that Marin knows by the end of the match, that the injury was real. You have to take into account, the context of the question/statement.
The reporter had just asked prior to Marin's statement, when Marin knew that victory was certain? - fishing for a comment about the injury. And Marin refuses to say "as soon as I saw her getting injured", because - from experience at that point in time, she knew that it might not be as bad, and if the opponent plays on, you better play on too and give your very best. That's her point. She did not feel sure of winning at the time.
It's Spanish - they talk like **** (I've studied Spanish for 3 years BTW, but that's a long time ago, and by now, I'm more or less unable to understand normal Spanish people talk in normal speed. I surely would not claim to understand this interview).
Seen in that context - I don't think we should spend a gazillion bytes of the interwebs to put her down. At least, I hope that I understood the intention of the statement, and the context of it.
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Then you can always debate, if it's correct that some Chinese players are actually known for using certain "tricks" to interrupt the game, such as faking injury. I saw a match, where a player had the tiniest of patches on his finger, and had to go and "fix it" all the time. He even had to get the doctor on court to make sure it was in place. It was clearly just interruptions whenever he needed the break, it was never when he scored points himself. That's also faking an injury.
In other sports, particularly football and handball, the players get hurt so bad all the time, yet there's a 95% chance they'll play on full speed, as soon as the refs whistle blows. Magic medical whistle that is

Cristiano Ronaldo for one has been healed by it often.