Naomi Osaka suffers straight-sets loss to Danielle Collins in Abu Dhabi opener

Naomi Osaka reacts after losing a point. Pic: Kamran Jebreili/AP

Naomi Osaka fell to defeat against Danielle Collins in her opening match at the Abu Dhabi Open.

The four-time grand slam champion made her comeback last month following the birth of her first child, reaching the second round of the Brisbane International before losing a close contest to Caroline Garcia in her opening match at the Australian Open.