Chain Poop
Chain Poop, Poop Chain 1 or Chain 1 was the first ever tennis chain. It was started originally by BMATF, lasting 51 rounds from October 6, 2007 to December 29, 2007. The length of all the rounds together lasts over an hour.
Layout
As this was the very first chain, the essential "vanilla" rules for how chains proceed were established here. None of the participants go a second time, unlike later chains, but notably at Round 3, Round 2 is completely ignored in favor of editing the serve in its own fashion. The chain progression that follows largely proceeds in an orderly fashion from this point onward.
The only rounds missing from the chain are TheRedFuzz's Round 42, Gb7Zone's Round 44, KonXII's Round 46, and seconteen13's concluding Round 51.
Rounds
The full match can be found here: