Anastasio Mateos v. Felix Lopez

Summary

Mateos sued Lopez for breach of cattle sale contract, claiming damages after Lopez allegedly sold 1,000 cattle to another party instead of honoring their agreement. The Supreme Court reversed the lower court's award to Mateos, finding that the original agreement required execution of a written contract and a 5,000 peso advance payment as security - conditions that Mateos failed to fulfill. The Court applied Civil Code Article 1124 on reciprocal obligations, ruling that since Mateos breached first by not providing the required advance and written contract, he could not claim damages for Lopez's subsequent actions. The decision demonstrates early Philippine jurisprudence on contract formation requirements and the doctrine that a party in breach cannot demand performance from the other party.