Clever Tennis Puns

I was having dinner with my family when I remembered a joke from this sub. I thought, "Hey, I could get a couple groans from this."

Me: "Why should you always arrive at the tennis court before it opens?"

Dad: "Why?"

Me: "First come, first serve."

Everyone gave a slight chuckle after that.

Dad: "So if you're all alone, would it be self-service?"

I was so stunned by how clever he out-dadjoked me.