unbelievable luck

Translations
невероятная удача
He had unbelievable luck winning the lottery twice.
Ему невероятно повезло, выиграв в лотерею дважды.
Definitions
A situation in which someone experiences an extraordinary or improbable series of fortunate events, often beyond what is considered normal or expected.
Words
luck

noun
удача
unbelievable

adjective
невероятный