It's a crap job, interviewing the guy who lost. Almost as bad as interviewing the football coach who is losing at halftime as he is jogging off the field.
That said, this is the profession they chose, so for pete's sake, do your job well. Do some research, write out a few generic openers, questions, etc. Know that you will have to interview the loser at some point, so do it with some class.
"Ernie, you played well all week, tough way for it to end. Tell me, how did you play today and did you hit the putt on 18 the way you wanted to? (Brian's question is perfect)"
"(Ernie's answer)"
"Well, hitting the ball the way you did, you're bound to have another shot at winning in the very near future, so best of luck, go get 'em next time."
"Back to you Bob"
That's not so hard, is it?