Extending partial tournaments

Let A be a ( 0 , 1 , ∗ ) -matrix with main diagonal all 0’s and such that if a i , j = 1 or ∗ then a j , i = ∗ or 0. Under what conditions on the row sums, and or column sums, of A is it possible to change the ∗ ’s to 0’s or 1’s and obtain a tournament matrix (the adjacency matrix of a tournament) with a specified score sequence? We answer this question in the case of regular and nearly regular tournaments. The result we give is best possible in the sense that no relaxation of any condition will always yield a matrix that can be so extended.