Mohammad never performed a miracle:
From: http://www.digitalsword.co.uk/truthaboutislam.htm
Sura 17:90-93 of the quran tells about how, when Muhammed was challenged to perform a miracle and prove he was from the true god, he could not perform any and here he actually says himself:
"Am I anything except a human messenger?".
In fact nowhere in the quran does Muhammed perform even one miracle, so to claim he performed miracles when the quran itself states he did not is simply wrong.
In Sura 6:37 Muhammed is asked to perform a miracle, he cannot and simply replies
"Allah is able to send down a sign" but doesn`t show one.
Again in the quran, in Sura 13:7, we find that Muhammed did not perform any miracles as the people are saying that even one sign would be enough to convince them, just one miracle performed by Muhammed - and yet he still does none....
"The unbelievers say:
"Why has no sign been sent down to him from his lord?"
You are only a warner, and there is a guide for every nation."
The quran tells us Muhammed did not do a single miracle or support his claims of prophethood with one single piece of evidence, nowhere in the quran does Muhammed perform a miracle and the account (hadiths, legends, etc etera) which do are not in the quran but were compiled hundreds of years after his death.
And they contradict the quran which tells us he did not give any signs.
So we have established beyond doubt that Muhammed did not perform any miracles , that he did not provide any evidence to support his claims and that the quran states this is true