What motivates Cyclops to ask Poseidon to interfere with Odysseus’s journey home?

Answer:

Cyclops is motivated by anger and a desire for revenge after being blinded by Odysseus. Furthermore, Odysseus's hubris leads him to reveal his true identity while sailing away, which allows the Cyclops to identify him by name in his prayer to Poseidon, requesting that Odysseus never reach home or that his journey be filled with hardship.