NEW YORK — Tim Duncan didn't expect to be participating in yet another midseason classic at age 38, after 17 1/2 years and nearly 54,000 total pro minutes in his illustrous career. But the San Antonio Spurs legend is here for the 2015 NBA All-Star Game, voted to a reserve frontcourt slot on the Western Conference squad, and this visit to New York could wind up serving as something of a surprising trip back to the future for the 15-time All-Star. [ Follow Dunks Don't Lie on Tumblr: The best slams from all of basketball ] After New Orleans Pelicans power forward Anthony Davis announced Wednesday that he would bow out of the All-Star game with a right shoulder sprain , NBA Commissioner Adam Silver appointed Dallas Mavericks power forward Dirk Nowitzki to replace Davis on the Western roster. But while it's the commissioner's duty to appoint injury replacements to All-Star rosters, when the injured player in question is a starter — as Davis was, thanks to the fan vote — it's the coach's responsibility to pick someone to take his place in the starting five. Golden State Warriors head coach Steve Kerr, who will lead the West at Madison Square Garden on Sunday night,...