Anthony Rizzo almost lost his World Series ring at the bottom of a massive lake ... but fortunately for the former Cubs superstar, a famed Chicago diver saved the day.
Yohei Yamada -- an experienced swimmer who makes a living helping those retrieve items they've lost in Lake Michigan -- told Block Club Chicago he once gave Rizzo a big hand when it came to his championship bling.
Yamada explained Rizzo's hardware had slipped off his hand after he had lost some weight .