Tennis star Serena Williams crashed out of the Miami Open in the first round. Williams slumping to a straight sets defeat against Japan's Naomi Osaka in the latest setback to the former world number one's comeback. Osaka, who won her first major title in Indian Wells last weekend, was superior throughout and fully deserved her 6-3, 6-2 win in just one hour and 17 minutes time. It was Williams' fourth match and second tournament appearance since returning from 13 months of maternity leave

The defeat was the first time Williams has lost her first match at an American hard court championship for 21 long career years. The 36-year-old, Serena William may have been unfairly unseeded here due to her lack of action over the past year, but could have no complaints with the defeat. In her comeback in Indian Wells, she made it through to round three, where she fell to sister Venus in straight sets.

Former Champion Serena Williams refused to speak to the media afterwards. The WTA and tournament will decide if she will be fined, with a potential cost expected to be about $1,000.

She released a brief statement more than 90 minutes after the end of the match, she said: "Every tournament is an opportunity for me to better understand the areas I need to improve to be my best. Naomi played a great match and I look forward to continuing my return by progressing every day. I am so grateful for my fans who continue to support me every step of this incredible journey.