Peter Kostis should not be reporting in the same group as Paul Casey

Sports journalists, just like any other journalists, have to live up to the highest standards.  They have to be informative and honest with their reporting.  CBS' decision to let on-course reporter Peter Kostis provide commentary in the Ian Poulter-Paul Casey match was a mistake.

Casey's longtime instructor is Kostis, and regardless of his professionalism, he has rooting interests. 

If Novak Djokovic plays in the US Open final, would you want his coach in the booth providing commentary?  If Michael Phelps is racing, would you want coach Bob Bowman in the booth as the race unfolds?

Because of the conflict of interest during the telecast, I was suspicious of the commentary I was getting. 

It is unlikely Kostis is going to be in the situation again where he is placed in the same group as his student.  But CBS needs to be more careful in placing commentators for broadcasts.