Ever since A Leg Up in the Race, Announcer has referred to Tennis Ball as "that clumsy Tennis Ball", due to him failing to climb up the ladder in the first challenge.
After Firey was frozen for calling Book "well-read" as a joke, Tennis Ball made the same joke, causing him to be frozen with the Freeze Juice by Book.
Status: Minor Enemies
- Main article: Firey and Tennis Ball
- Main article: Tennis Ball and Golf Ball
Status: Best Friends
Tennis Ball is mad at Leafy for 'bribing' Bubble to vote for him in Reveal Novum. However, he is one of the very few who is not shown to be mad directly at Leafy for stealing Dream Island. He even defends Leafy in a way by saying that it shouldn't necessary to capture Leafy to regain Dream Island in Yeah, Who? I Wanna Know.
In Insectophobe's Nightmare 3, Match calls Tennis Ball a nice guy, but only to get Tennis Ball to build a new Recovery Center.
In Zeeky Boogy Doog, Match says Tennis Ball deserved to die as he's been so lazy, due to him refuses to build a Recovery Center in Insectophobe's Nightmare 3.
In Get in the Van, Match angrily slaps Tennis Ball for thinking that Rocky's vomiting is cute.
- Main article: Rocky and Tennis Ball
Tennis Ball and Rocky are shown to be good friends.
In Take the Plunge: Part 1, when given the chance to speak, Rocky called Tennis Ball his "good 'ol friend".
In Take the Plunge: Part 2, when asked by Pin, Rocky chose Tennis Ball to be on his team.
In Insectophobe's Nightmare, Rocky once again chose Tennis Ball on his team first.
In Get in the Van, Tennis Ball wanted Rocky to win the prize, saying that he wants Rocky's barfs back, as he states that it is cute.
Status: Good Friends