Boxing superstar Devin Haney is suing his ex-fiancée once again ... this time claiming she's wrongfully keeping $350,000 worth of gifts he says he gave her in anticipation of their wedding.
Haney filed the latest suit against Leena Sayed in Los Angeles County last week ... alleging she won't return several pricey handbags and jewelry.
Haney claimed he got her the items -- which included things like Hermes bags, an Audemars Piguet watch, a diamond ring, diamond earrings and several other pricey purses -- under the premise that they were going to tie the knot.