Robert ran

 Try this: "Robert ran rings around the Roman ruins"

Now this: "Roberto ran rings around the Roman ruins"

What's the difference? Just one vowel changes what you do with your pronunciation. In the first, I, as a native speaker of English, would only partially pronounce the t in Robert, there would be no aspiration; it would be too fussy. I would make the articulation of the /t/- tip of the tongue on the alveolar ridge (that bump behind your top teeth)but not develop into a full-blown /t/, instead it simply ellides into the English /r/ in ran.