Charles Barkley played in the golden era of the NBA. His career began in the 1984-85 season at the height of the Larry Bird/Magic Johnson rivalry, and it ended after the 1999-00 campaign -- two seasons following Michael Jordan's second retirement from the Chicago Bulls after winning six championships in the 1990s. Barkley played against many of the most talented players the sport has ever seen, but when asked about the best player he ever had to guard, one Boston Celtics legend stood above the rest.