【Question 13】  
A, B, C, and D are playing table tennis (no ties), and every two of them will play a match. After the matches, the results are as follows: A won 3 matches, B won 1 match, and D did not win any. C won $\qquad$ matches.
【Analysis and Solution】
Mathematics in sports competitions.
A total of $3+2+1=6$ matches;
Team C won $6-(3+1+0)=2$ matches.