During the recent Gold medal match against Serena (2nd set I think). Masha was having a horrid day. Nothing was going in her favor throughout the match. Serena however was playing very well. Masha challenged in the hope that something would go her way but she knew it wasn't out.
This is the second time I've seen Masha lose it. The first time was against Kvitova which she lost to recently last year during a grand slam tourney (I forget which one). She wasn't tearing up like in this one but you could tell she was gonna explode. This one however looks a bit worse. Glad she cheered up and was back to normal again after the match.