Two opposite trajectories: Sara Bejlek, 20 years old, world No. 35, strong with 119 wins on clay, and Sloane Stephens, 33 years old, world No. 361, 2018 Roland Garros finalist. Stephens won all three of her qualifiers, while Bejlek has four losses in her last five matches on clay.

Their first duel. The Czech left-hander could trouble Stephens, but the American has won 72% of her recent matches against lefties. At stake: for Bejlek, to get past the second round; for Stephens, to rekindle the flame.

The key will be Bejlek’s serve, recently less reliable, against her opponent’s experienced return.