The cliche goes, "Don't be sad it's over, be happy that it happened." And that was exactly how everyone was feeling watching Serena Williams leave a tennis court for the final time on Friday.
Williams, a 23-time major champion, officially ended her playing career with an exhilarating three-set loss to Australia's Ajla Tomljanovic, in which she saved half a dozen match points before bowing out.
Instantly the hashtag #ThankYouSerena began trending as sports fans from around the world said goodbye to one of the greatest of all time.
Here are some of the countless reactions.
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