At times, during commentary, commentators speak sentences like "Playing well, Victor is", "A great player, Steven was".
1 Answer
It's grammatical but it's "marked", meaning that this word order isn't the normal declarative order but is chosen intentionally to create emphasis. Even then, it isn't usual, and I'm surprised by your implication that commentators are using it frequently. However, sometimes this order is used for humorous effect, as it reflects the sentence construction of the character Yoda in the Star Wars movies.
Your punctuation is correct.
subj + aux
been moved to the end, or has the predicate phrase been moved to the front? Also, since this is spoken English, there are no punctuation standards; do what you think best.