Elise Mertens enters the Madrid 1/16-finals as the heavy favourite, ranked 21st and priced at 1.43 on Pinnacle. The Belgian has mixed recent form on clay, posting two wins against Eala and Seidel but suffering losses to Muchova and Cirstea in her last five matches. Mertens holds a 0–1 head-to-head record against Pliskova, having never beaten her opponent, though she remains the clear betting preference at this stage of the tournament.

Karolina Pliskova, ranked 197th and representing Czech Republic, arrives as a significant underdog at 3.07 odds following impressive recent form that includes four wins in her last five matches, most notably defeating Maria Sakkari in straight sets. The away player's momentum contrasts with her ranking, having defeated Alexandrova and Sasnovich while reaching the 1/16-finals knockout round. Pliskova's sole head-to-head victory over Mertens provides a small edge in their matchup history, though she faces a steep challenge against a top-25 opponent on clay.