Petra Martic defeated Anna Kalinskaya 6–3, 4–6, 6–3 in the first round of the Madrid Masters 1000 on clay on 30 April 2023, pulling off a minor upset against the pre-match favourite. Kalinskaya, priced at 1.93, entered as the slight favourite, but Martic's steadier performance across the match proved decisive. The Croatian won the opening set convincingly before Kalinskaya levelled with a second-set victory; however, Martic regained control in the decider to secure progression. The result demonstrated Martic's resilience on the Madrid clay and marked an important early-round scalp in her campaign at the prestigious event.