SAITAMA, Japan—The United States and Spain played for Olympic gold in 2008 and 2012, then in the semifinals in 2016. And at the Tokyo Games, the top teams in the FIBA world rankings will meet again—just earlier than has been the norm. The three-time reigning Olympic champion Americans will face reigning World Cup champion Spain in the quarterfinals of the men’s tournament at the Tokyo Games on Tuesday, a matchup of teams that finished second in their respective groups at the Olympics. Spain fell outside of the seeded pool, and knew it had exposed itself to a potential matchup with the United States, by losing the group-play finale to Slovenia on Sunday. And about an hour later, when FIBA held the Olympic draw, the matchup was set. “If you’re going to get that gold medal, you’re going to beat everybody,” Spain center Marc Gasol said. “At that point, it doesn’t …