Mirra Andreeva secured one of the biggest wins of her young tennis career Monday at Wimbledon – but for a few moments after match point, she had no idea.

Mirra Andreeva was the last person on Centre Court to realize she beat Emma Navarro, a result that made her the youngest woman in 18 years to reach the Wimbledon quarterfinals.

Mirra Andreeva’s stunning Centre Court debut ended in bizarre fashion when she forgot the score and did not realise she had won the match.The Russian teenager became the youngest woman to reach the Wimbledon quarter-finals in 18 years by breezing through round four with a rapid 6-2 6-3 win over world number 10 Emma Navarro.