Texas won the 2002 College World Series without losing a game. Here's the list of the 19 undefeated CWS teams:

2002 Texas, 57-15, 4-0
2001 Miami, 53-12, 4-0
2000 Louisiana State, 52-17, 4-0
1997 Louisiana State, 57-13, 4-0
1996 Louisiana State, 52-15, 4-0
1995 Cal State Fullerton, 57-9, 4-0
1994 Oklahoma, 57-14, 4-0
1992 Pepperdine, 44-11-1, 4-0
1991 Louisiana State, 47-18, 4-0
1983 Texas, 56-13, 5-0
1982 Miami, 49-18, 5-0
1978 Southern California, 46-9, 5-0
1973 Southern California, 42-11, 5-0
1968 Southern California, 38-13, 5-0
1961 Southern California, 34-8, 5-0
1957 California, 28-9, 5-0
1951 Oklahoma, 15-9, 4-0
1949 Texas, 18-7, 3-0
1947 California, 27-10, 2-0