Australian tennis player Kimberly Birrell defeated fifth-seeded Jessica Pegula in the first round of the 2026 French Open on Tuesday evening.

The victory marks one of the biggest upsets of the tournament thus far, removing a top-seeded contender from the draw in the opening round.

Birrell secured the win at Roland Garros in Paris after rallying from an early deficit. Pegula, the fifth seed in the women's singles draw [1], dominated the opening set but could not maintain the momentum through the remainder of the match.

Birrell won the match with a final score of 1-6, 6-4, 6-3 [2]. The Australian player overcame the initial 1-6 deficit to take the next two sets, securing her place in the second round of the tournament.

This result represents a significant career milestone for Birrell, who managed to outlast the American favorite on the clay courts of Paris. The match saw a shift in momentum after the first set, as Birrell adjusted her strategy to break through Pegula's defense.

Pegula entered the tournament as a primary contender for the title, but her exit in the first round creates a wide-open section of the bracket. The loss is a rare early exit for the U.S. player in a Grand Slam event.

Birrell won the match with a final score of 1-6, 6-4, 6-3.

The early exit of a top-five seed disrupts the projected path to the finals and increases the opportunity for lower-ranked players to advance deep into the tournament. Birrell's ability to recover from a dominant first set demonstrates a mental resilience that may make her a dangerous opponent in the subsequent rounds of the 2026 French Open.