Serena Williams will miss the WTA Finals for the second year in a row, citing a right shoulder injury.The WTA announced Williams’ withdrawal from the tournament a week before play begins next Sunday in Singapore, releasing a video from the 22-time Grand Slam singles champion.

Williams said she is “really, really bummed” to skip the event.

She hasn’t played since losing to Karolina Pliskova in the U.S. Open semifinals in early September, a defeat that resulted in Williams ceding the No. 1 ranking to Angelique Kerber after a three-year stay at the top.

Williams played in only eight tournaments in 2016, winning two of them, including the Wimbledon in July.