The biggest change for Americans watching the Winter Olympics on television this month will likely be the first face they see on the screen.
Mike Tirico is replacing Bob Costas as host of NBC's prime-time Olympics coverage, which starts Thursday from Pyeongchang, South Korea. Costas hosted 11 Olympics starting in 1992 until he stepped down last year. He became as identified with the event as Jim McKay was for an earlier generation.
"I'm taking the approach of I'm following him, not replacing him," Tirico said. "You don't replace someone like Bob."
NBC has groomed Tirico, 51, and he's studied up on Alpine skiing and the luge. Whether he's...