4.5 is not the issue, the 6'6" Del Potro height is.
Cindy, I am 6'6" , my brother is 6'5 3/4"
(He's really 6'6" too, but he is a known sandbagger)
We are doubles partners. If I can get my brother to wear a skirt, can we play in your mixed league as a team?
Of course, neither of us is even close to 4.5, so we'd fit right in......