The phrase "unrivaled opportunity" means that there is no other chance or option that is better or can compare to it. It signifies an exceptional and unmatched chance or possibility. Full definition
The brain grows at its fastest rate during these years, creating unrivaled opportunities for learning. (gse.harvard.edu)
The CLOC Institute certainly proves its claim of offering corporate legal professionals and their counterparts unrivaled opportunities to learn, share, and connect. (wkelmsolutions.com)
Through these channels, the churches have an unrivaled opportunity to help develop understanding of alcoholism at the grass roots of our population. (religion-online.org)