BARCELONA — Regal Barcelona came into Thursday night letting up just 59 points per game. Montepaschi Siena scored more than half that in the final nine minutes and sent the team from Catalunya packing with their first loss of the year, a 77-74 final. And though Siena’s Coach Simone Pianigiani has locked up five straight Italian Championships and is coming off of a Euroleague Final Four, this win belongs right near the top of his list. Why? Because he beat Europe’s best