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

• Osaka admits to ‘dilemma’ after loss to Talia Gibson

• Norrie, Boulter and Jones all out to end British hopes

Naomi 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 opening match of the Miami Open.

Osaka, who received a first-round bye as the 16th seed in Miami, moved sluggishly in an error-strewn performance and was outplayed by the talented 21-year-old Gibson, who will play Iva Jovic in the next round.