Q: Are these numbers for the battle of Maritsa correct?

I involuntarily stumbled in this article:
https://en.wikipedia.org/wiki/Battle_of_Maritsa
I took a look at the talk page, but the result doesn't sound plausible at all.
I decided to ask to the real experts.
Are the said numbers correct? If not, which ones?

Lala Sahin Pasha ambushed the Serbs at night. Considering the soldiers were also drinking it was easier to beat them in the ambush. Add to it that the commander died in battle and large part of the Army fled to the river where they drowned.
 
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