<p>Naomi Osaka showed no signs of discomfort from the injury that forced her to miss a final on Saturday but the former champion still had to dig deep to beat fellow Japanese Misaki Doi 6-2 5-7 6-2 to kick off her US Open campaign.</p>.<p>A left hamstring injury forced Osaka to withdraw from the Western & Southern Open final against Victoria Azarenka but the fourth seed's movement did not seem to be affected against Doi on Monday.</p>.<p>Osaka, the 2018 champion at Flushing Meadows, started strongly in the opening set but struggled in the second as her unforced errors mounted and Doi levelled the match at 1-1 with a second break of her opponent's serve.</p>.<p>Normal service was resumed in the decider for Osaka, who walked out to court wearing a mask featuring the name of Breonna Taylor, a Black woman killed in March by police officers who burst into her apartment.</p>.<p>Osaka will next play Camila Giorgi, who earlier beat Alison van Uytvanck 2-6 6-1 7-5. </p>
<p>Naomi Osaka showed no signs of discomfort from the injury that forced her to miss a final on Saturday but the former champion still had to dig deep to beat fellow Japanese Misaki Doi 6-2 5-7 6-2 to kick off her US Open campaign.</p>.<p>A left hamstring injury forced Osaka to withdraw from the Western & Southern Open final against Victoria Azarenka but the fourth seed's movement did not seem to be affected against Doi on Monday.</p>.<p>Osaka, the 2018 champion at Flushing Meadows, started strongly in the opening set but struggled in the second as her unforced errors mounted and Doi levelled the match at 1-1 with a second break of her opponent's serve.</p>.<p>Normal service was resumed in the decider for Osaka, who walked out to court wearing a mask featuring the name of Breonna Taylor, a Black woman killed in March by police officers who burst into her apartment.</p>.<p>Osaka will next play Camila Giorgi, who earlier beat Alison van Uytvanck 2-6 6-1 7-5. </p>