<p>Well, the Fruit Circuit was never a real-life thing (as in, there were never any events run with actual marbles). It's more of a piece of lore for the origins of the four teams you listed. Here's an official blog post that has some details about it, along with other lore for the O'rangers :
https://www.marble-sports.com/retrollspective-orangers/1295/</p><p>
</p><p>The main "legacy" of the Fruit Circuit is that the teams from it have some rivalries with each other. There's a possible "Citrus rivalry" between the O'rangers, Limers, and Mellow Yellow, and especially the rivalry between the Limers and Raspberry Racers (more details about the RR/Limers rivalry in this reddit post, along with other misc. lore)
https://www.reddit.com/r/Marblelympics/comments/7melnb/approved_answers_from_the_last_community_qa/ </p><p>
</p><p>This is the best info I have. I hope this helps.</p>