The Sinquefield Cup starts August 5, and it will start without Vladimir Kramnik. Kramnik is suffering from back pain (been there, done that; I don't recommend it), so he's going to take the month off to try to get it under control. In the mid-2000s he suffered from a debilitating arthritis, and he thinks there's a chance that this might be a recurrence of the problem.
While Kramnik tries to recuperate in time for the Olympiad, Peter Svidler will take his place if he can secure a visa. The other participants will be Maxime Vachier-Lagrave, Fabiano Caruana, Levon Aronian, Hikaru Nakamura, Wesley So, Viswanathan Anand, Anish Giri, Veselin Topalov, and (the slumping) Ding Liren.