Returning to the site of her last singles match, which she had to stop after less than a set because of an injury on June 29, 2021, and seven of her major championships, the 40-year-old Williams came within two points of victory.
"When I saw the draw, I was really scared," Tan said with a laugh, "because it's Serena Williams.
With her older sister, Venus, jumping out of her guest box seat at Centre Court to celebrate the best of points, Serena Williams was oh-so-close to pulling out a topsy-turvy match that lasted 3 hours, 11 minutes and was contested with the retractable roof shut for the last two sets.
This is one indication of how things were at the get-go: Of the 24-year-old Tan's first 11 points, only one came via a winner she produced.
While Williams — who wore two pieces of black tape on her right cheek; the reason was not immediately clear — recovered from dropping the opening two games to lead 4-2, she reversed course again and allowed Tan to quickly climb back into that set?
Clearly enjoying herself — and the setting, the moment, the way it all was going — she broke to lead 6-5 with the help of a cross-court forehand winner, looked at her guest box, raised a fist and waved her arms to ask for more noise from a crowd that was loudly backing Williams.
Might Williams exit a major in the first round for only the third time in 80 appearances (the previous two were a loss at the 2012 French Open and that mid-match retirement at Wimbledon last year).
Tan was a point from victory at 6-5, and Williams erased that with a forehand winner — beginning a seven-point run that not only sent the match to a tiebreaker but put her ahead 4-0 in it.