The phrase "lucky bounce" refers to a fortunate or unexpected outcome that occurs by chance, especially in sports. It means that something good happened due to luck rather than skill or planning. Full definition
We have only 1 chance: Dubnyk stands on his head and we get really lucky bounces for the full series. (sbnation.com)
Plus Thomas got a really lucky bounce on his control (I don't know who it went off). (7amkickoff.com)
His inability to convert a 12 - foot birdie putt after getting an extremely lucky bounce off the hillside on the par - 3 seventh was indicative of the struggles that caused Tiger earlier to wonder just WTF was going on. (sbnation.com)