Naomi Osaka is on to the third round of the US Open.

The defending champion received a walkover in the second round after her opponent, Olga Danilovic, withdrew due to medical reasons.

The Serbian revealed on Instagram that she has been dealing with a “non-covid related viral illness” for the past few days.

In her place, Simona Halep was shuffled into Arthur Ashe stadium, where she advanced to the third round after defeating Kristina Kucova in straight sets, 6-3, 6-1.