Osaka says US Open win has given her belief

Japanese star Naomi Osaka said her US Open victory in September had given her the self-belief to be able to come from behind and win tight matches.

Osaka was speaking after recovering from losing the first set of her Brisbane International quarter-final to Latvia's Anastasija Sevastova on Thursday.

The world number five overhauled Sevastova to win 3-6, 6-0, 6-4 and reach the semi-finals of the season-opening tournament.

"I feel like right now I'm really confident in myself, and I feel like the off-season training that I've been doing is really paying off," she said.

"And I'm not sure if I would have had the same feeling six months ago. Six months ago I hadn't won the US Open."