World No.1 Serena Williams has announced her withdrawal from next week’s China Open in Beijing and the WTA Finals in Singapore, ending her season.

“I am taking a proactive step and withdrawing from tournaments in Beijing and Singapore to properly address my health and take the time to heal,” the 21-time grand slam winner said on Thursday in a statement.

The 2015 WTA Finals in Singapore will be the 45th edition of the elite singles event and the 40th for the doubles competition.

The tournament will be contested by eight singles players and eight doubles teams.