caption: Tennis fans say a subtle change to <PERSON>'s appearance meant they knew she meant business.
exif: {"Image ImageDescription": "United States' Serena Williams celebrates after winning a point against United States' Alison Riske during a women's quarterfinal match on day eight of the Wimbledon Tennis Championships in London, Tuesday, July 9, 2019. (AP Photo/Kirsty Wigglesworth)", "Image XResolution": "336371/2000", "Image YResolution": "336371/2000", "Image ResolutionUnit": "Pixels/Inch", "Image Artist": "Kirsty Wigglesworth", "Image Copyright": "Copyright 2019 The Associated Press. All rights reserved No"}