Serena Williams is unsure whether she will play at Wimbledon again, but says Tuesday's first-round exit has motivated her for future Grand Slams.
The 23-time major winner lost to France's Harmony Tan in a gripping three-set match as she returned to SW19 after a year out with injury.
Asked whether it would be her last appearance at the All England Club, the 40-year-old American said: "That's a question I can't answer. I don't know.
"Who knows where I'll pop up?"
Seven-time Wimbledon singles champion Williams - who is chasing Margaret Court's record of 24 Grand Slam singles titles - said she did not want Tuesday's loss to be her final memory of a court on which she has had so much success.