Have your career stats as follows:
Disregard all the other attributes, especially
Stamina. As long as you remain focused on what
your player and CPU is doing and try to win the
point as soon as possible, Stamina does not
matter. Reflexes do not matter also, unless you
really like coming to net. However, most players
probably choose to use the baseline and only come
up to the net when the other player or CPU does a
dump volley. Volley is not really that useful
either, especially if you are a baseline player.
Spins are only useful if you know exactly when and
how to use them (like the lob), so disregard these
attributes. Precision is fairly important so if
you want to divide the Focus and Precision with 5
each, then it may be useful.