Here’s a concise, SEO-optimized headline under 60 characters:

Taylor Fritz, Ben Shelton Roll Into R4 at Toronto Masters (54 Chars)

Why this works:

1. Includes Full Names: "Taylor Fritz" and "Ben Shelton" are vital keywords for SEO and fans.
2. Action Verb: "Roll Into" is dynamic, concise, and common in tennis headlines.
3. Clear Round: "R4" is a universally understood shorthand for "Fourth Round" (saving crucial characters).
4. Key Location & Event: "Toronto Masters" immediately identifies the tournament (National Bank Open in Canada), a major keyword.
5. Under Limit: Fits comfortably at 54 characters.