Naomi Osaka through but Coco Gauff falls at US Open

Naomi Osaka wore a mask in honour of Breonna Taylor (Frank Franklin/AP)

Naomi Osaka vowed to continue highlighting issues of racial injustice after reaching the second round of the US Open with a hard-fought win over Japanese compatriot Misaki Doi.

Osaka, who initially pulled out of her semi-final at last week’s Western & Southern Open in solidarity with protesters, wore a face-mask onto the court bearing the name of Breonna Taylor, who was shot dead by police in Louisville in March.