Hi there! I see you're encountering a black screen when trying to use the MLB app on your Android device with WebKit browser on Android 10. I'd love to help you get it working again. To start, can you tell me if the black screen occurs immediately after opening the app, or after trying to play a video? Also, have you tried any fixes yet?

Meanwhile, here’s a step-by-step you can try for your Android device:

1. Force stop the app:
- Go to your device's Settings
- Tap on "Apps" or "Applications"
- Find and tap on the MLB app
- Tap "Force stop" to close it completely

2. Clear cache and data:
- Within the same app info screen, tap "Storage"
- Tap "Clear Cache" first, then try opening the app again
- If the black screen persists, tap "Clear Data" (this will reset app settings, so you may need to log in again)

3. Restart your device:
Sometimes a simple reboot can resolve temporary glitches.

4. Uninstall and reinstall the MLB app:
This ensures you have the latest version and a clean installation.

If after these steps the black screen problem remains, it might help to check for any updates to your Android OS or the app itself. Also, make sure your internet connection is stable as the app streams live content.

Let me know which steps you've tried or if you have any questions while going through them!