San Antonio Spurs head coach Gregg Popovich is one win away from becoming the NBA's all-time leader in coaching wins. Popovich has coached the Spurs since 1996 and has 1,335 wins along with 5 NBA Championships. Shannon Sharpe decides if Chicago Bulls, Los Angeles Lakers coach Phil Jackson, former Boston Celtics coach Red Auerbach or Greg Popovich is the greatest coach of all-time.