Emma Raducanu picked up her best win by ranking since May, ousting No. 7 seed Marta Kostyuk in the opening round of the Mubadala Citi DC Open on Tuesday. She will face former World No. 1 Naomi Osaka in the second round.

Emma Raducanu was no match for four-time Grand Slam champion Naomi Osaka at the Citi Open, with the Brit progressing into the quarter-finals of the tournament with a 6-4, 6-2 victory. It was the first time the two titans of the women's game had gone head-to-head, with Raducanu dominating the contest throughout.

Her victory has set up a battle between two former Grand Slam champions, Raducanu and Osaka, who have never faced each other on the WTA Tour. Raducanu: I don’t have many friends

Emma Raducanu and Naomi Osaka have both won the US Open, but the Brit has explained why she has struggled to form a friendship with the Japanese star, and others on the tour