Balls should be good for at least six sets, and for more for the average player. But if the rallies are long, they do not last as long as this. There is a fuzz on the surface that wears off on the hard court. ↗
Golf is a game to me. Other players work extremely hard all year long. I work hard before Augusta. I know I get good results when I practice, but it also wears me out. It literally wore me out even when I was in my 20s. ↗