Two generations of Russians with a shared desire for Grand Slam success. Maria Sharapova, a five-time Major champion, made sure the 19-year-old understood exactly what she was witnessing when she watched Mirra Andreeva win Roland Garros on Saturday.

Bent over with her hands covering her face, her knees getting dirtied on the red clay court, Mirra Andreeva was celebrating — processing might be the more appropriate word — how she had finally overco...