You gotta love the Chinese. They have no problem asking the tough questions. They straight up ask Ana whether she and Fernando are more the friends, and well...she blushes and kind of avoids the question. You can see the video here (you need to use Internet Explorer; click to 1:22).
Arguable whether she was avoiding the question, just saying they were good friends and really meaning that and nothing more, or just being Ana and giggling through a question about boys. But she was definitely blushing. My crack CSI team definitely deduced that one.
(Thanks to Ana's Forums for finding the video; Pic from Mens Tennis Forum)