I take posters points with Serena should play more tournaments,also I felt she should have played a 'warm up' grass match prior to Wimbledon.
The grass is slippery that is why she injured herself,Roger and Andy said the same thing,especially when the roof is closed
Serena's opponent Aliaksandra also said she was felt unsafe on the grass in her match
Why cant players wear a different type of sole on their shoe,which they used to allow at Wimbledon many years ago,that would grasp the underfoot better and we would not see the players,slip.slide and fall over.,like Serena and Mannarino have to retire in their matches due to injury.