Novak Djokovic has announced his withdrawal from next week's Miami Open in order to spend more time with his family.
The world number one had been expected to make his first appearance since claiming his ninth Australian Open title in February.
But Djokovic wrote on social media: "Dear fans, I'm very sorry to announce that this year I won't travel to Miami to compete.
"I decided to use this precious time at home to stay with my family.
"With all restrictions, I need to find balance in my time on tour and at home. I look forward to coming back next year!"
Earlier this month Djokovic equalled Federer's record of 310 weeks at the top of the world rankings.