I think they're tied for #1 in that category with Texas. Other notables:
Texas has wins over current #2 UCLA, #3 South Carolina, #6 LSU, #10 Oklahoma, #12 Baylor, #14 Ole Miss, #18 Kentucky and #21 North Carolina.
South Carolina has wins over current #4 Texas, #5 Vanderbilt, #9 Louisville and #11 Duke.
UCLA has wins over current #7 Michigan, #8 Ohio State, #10 Oklahoma, #11 Duke, #13 Michigan State, #15 Iowa, #20 Maryland, #21 North Carolina and #22 Tennessee.
UCONN has wins over current #7 Michigan, #8 Ohio State, #9 Louisville, #15 Iowa and #22 Tennessee
If LSU beats South Carolina this weekend I think they officially enter the #1 seed conversation too. They currently have wins over #4 Texas, #10 Oklahoma and #11 Duke.