Serena Williams unsure of Wimbledon future, but wants more Grand Slams

Serena Williams doesn't know if she will play at Wimbledon again, but she does know that Tuesday's first-round exit has motivated her for future Grand Slams.

She returned to SW19 after a year out with an injury and lost in a three-set match to a player she had never met before.

The 40-year-old American was asked if it would be her last appearance at the All England Club. I'm not sure.

I don't know where I'll pop up.

Williams said she didn't want Tuesday's loss to be her last memory of the court where she has had so much success.

She said obviously not. You're familiar with me. It's definitely not.

I didn't give up. I might have given more. I could have given more. Today was what I was able to do. You have to be okay with that at some point.

Williams was hurt in her first-round match against Sasnovich and had to retire from the match.

She admitted earlier this month that she had doubts about her future in tennis.

Williams said an appearance at the US Open could entice her to continue training after her loss to Tan.

She first won a Grand Slam in New York and it is always special.

There's always motivation to improve.

The American great said that her performance against Tan had served as fuel to keep going.

"It definitely makes me want to hit the practice courts because when you're so close - any other opponent would have suited my game better - I definitely think it's okay Serena, you can do it if you want."

She said that she did well physically. Winning those key points is something that you have to have in order to be successful.

There is more match toughness if you play week in, week out. If I were playing matches, I wouldn't miss some of those points.