Jil Teichmann upset fourth-seeded Elina Svitolina 2–6, 6–4, 7–6 in the first round of the Madrid Masters 1000 on clay on 29 April 2021. Svitolina, the pre-match favourite at 1.33 odds, lost the opening set decisively but recovered to level the match before Teichmann secured victory in a tight third set. The Swiss player's comeback from a set down against the higher-ranked Ukrainian represents a significant scalp at the elite level and signals her growing competitiveness on the WTA circuit.