After listing it 18 months ago, tennis star Serena Williams finally sold her Los Angeles house Friday for $8.1 million.

She originally asked $12 million for the home when it was listed in October 2017, as Mansion Global previously reported. It was last put on the market in January for $9.995 million, according to public listing records.

Although the home sold for less than its asking price, it wasn’t a loss for the tennis champion. Ms. Williams, 37, purchased the home in 2006 for $6.62 million under a trust, with her sister Lyndrea Price as the trustee, according to property records.

Buying agent Fred Bernstein of Westside Estate Agency could not disclose who the buyer is. However he said the buyer had been interested in the home for a while.

“They liked the property—it’s one of the largest lots on Stone Canyon,” he told Mansion Global.

Gregory Piechota and Amit Lalji of Keller Williams Beverly Hills represented Ms. Williams. They did not immediately return a request for comment.

Built in 1935, the 6,101-square-foot house sits on a 2.76-acre lot. It has six bedrooms and seven bathrooms.

The traditional-style home also has a bar, private hiking trails and a swimming pool with a cabana, according to the listing.

Ms. Williams long held the title as the world’s No. 1 female singles player and has won 39 major titles, 23 of which were in singles. She still lives in Los Angeles with her husband, Reddit co-founder Alexis Ohanian, and their daughter, Alexis Olympia Ohanian Jr., according to the Los Angeles Times, who first reported the sale.

A voicemail left for Ms. Williams’s publicist was not returned.