'Saving Private Ryan' came along at a critical time for Matt Damon. He was already a rising star, but he was mostly known for his own productions, and his work alongside best friend Ben Affleck. As 'Saving Private Ryan' went into pre-production, Damon was finishing up the movie 'Good Will Hunting' with Robin Williams.
Spielberg took a trip to the set of 'Good Will Hunting' to see Williams, who was a good friend of his, and was introduced to Damon for the first time. Having been impressed by both the charisma and performance of the young actor when he visited the set, a mere two weeks later Spielberg phoned Damon and asked him if he'd be interested in appearing in the movie. The rest is history. Would Damon have made it to the A-List anyway? Almost certainly, but a helping hand on the way never hurts!