Naomi Osaka casts doubt on tennis future after first-round defeat in Miami

Osaka admits to ‘dilemma’ after loss to Talia GibsonNorrie, Boulter and Jones all out to end British hopesNaomi Osaka has said she does not intend to continue competing if she frequently loses in first round matches after suffering a disappointing 7-5, 6-4 defeat to Australia’s Talia Gibson in her...