Oh no! This would be such a shame!
A source explains:
"Matt is putting a brave face on things but his voice is in bad shape and he could miss the semi-final. He's really low because he's desperate to be at his best for such a vital show. Mary and Matt have both been struggling with their throats for the past week. Matt was advised to rest his voice by doctors and so he didn't perform. Mary did sing but complained of a bad throat afterwards. At the moment we're hoping they will be fit to appear but we just don't know. It will be a disaster if they have to pull out."
Awful! We seriously hope that these two can take every chance they can until Saturday to get themselves rested!
We wouldn't want to see any have to back down at this point - they've worked so SO hard!
Best of luck, guys! We're thinking of you!
[Images via WENN.]