names = {'one', 'two', 'three'};
middle = {' vs '};
N = length(names);
reshape(strcat({names{repmat(1:N, N, 1)}}, middle, {names{repmat(1:N, N, 1)'}}), N, N)'
ans =
'one vs one' 'one vs two' 'one vs three'
'two vs one' 'two vs two' 'two vs three'
'three vs one' 'three vs two' 'three vs three'
