Former world number one Venus Williams was overpowered by qualifier Danielle Collins in a stunning quarter-final upset at the Miami Open.

93rd ranked Collins played with intensity to come out 6-2, 6-3 win over the eighth seed Williams,

The 93rd ranked Collins set up a semi-final against French open champion Jelena Ostapenko.

Latvian Ostapenko overpowered Ukrainian fourth seed Elina Svitolina in two tie-breaks to win 7-6 7-6

In the Day’s other semi-final American 13th seed Sloane Stephens brushed against unseeded Victoria Azarenka 3-6, 6-2, 6-1.