The best of three refers to a competition or set of games where the winner is determined by who wins two out of three matches.

तीन मुकाबलों में से सर्वश्रेष्ठ

English Usage: The tennis match is the best of three sets.

Hindi Usage: टेनिस मैच तीन सेटों में से सर्वश्रेष्ठ है।