MLB on Sling TV: Here’s How to Watch Major League Baseball Games Live Online Without Cable. Sling TV lets you livestream ESPN, TBS, Fox Sports, MLB Network and other channels for MLB games.

Aside from a 4K-compatible streaming device, you'll need a 4K-compatible TV in order to stream Sling in 4K. You can check if your TV has at least one port that supports HDCP 2.2.