For setting, emotion, drama, joy, heartache, shot-making, atmosphere—everything that goes into a great tennis match—nothing topped this duel of the Cinderellas.

When Barbora Krejcikova and Elena Rybakina met in the Wimbledon semifinals, they had a hard act to follow. Jasmine Paolini had just defeated Donna Vekic in the longest women's singles semifinal in ...