For less gamesmanship play Senior Age Group.
You're not getting paid for this I assume, and your mortgage doesn't depend on winning, so enjoy participating rather than the winning. Read Kipling's poem "IF" about the difference winning and losing.
If your looking to return to nature and you're in Kali, try Harbin Hot Springs. It's a hippie nudist camp, the Watsu there is great, ask for Diana. There's a court at a school nearby if you have withdrawal's. They probably have hot rocks but just in case bring your own.
Where were the grass courts, did you play barefoot?
"...the human emotional system was not designed to endure the mental rigors of a tennis match." Dr. Allen Fox