It suggests the seven-time Grand Slam singles champion is preparing for the Australian Open later that month, a tournament she has twice lost in the final.
Williams made her pro tournament debut in 1994 in Oakland, California and has played at least two WTA events in each season since, the tour said.
She last played in singles at the U.S. Open in August, losing in three sets to 11th-seeded Karolina Muchova in the first round.
Ranked No. 570, Williams is five years older than the next oldest ranked players, Naoko Eto and Bethanie Mattek-Sands.
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AP tennis: https://apnews.com/hub/tennis
