This looks to be related to the Razer Chroma issue.
From your report:
Problem signature:
P1: Overwatch.exe
P2: 1.42.0.63869
P3: 5dc5d1fd
P4: RzChromaSDK64.dll_unloaded
Use the steps here to resolve this, paying special attention to the files you may need to manually locate and remove to fully complete the steps.
You may also want to disable the SteamWebHelper service, as it will hinder fps performance in Overwatch.