The guy I’ve been playing with most days here is only 5’6”. He was a touring professional 6 years ago when he was a teenager. His serve is quite good. But he’s streaky. On his good days he can serve double digit aces against me. Other days his percentage goes down. He has a really clean and simple motion with a little bit of top on his first serve, with good leg thrust and lands 3-4 feet inside the court.