Table schema:
CREATE TABLE table_name_87 (round INTEGER, event VARCHAR, location VARCHAR, method VARCHAR)

Question: What is the lowest Round with the Location, Las Vegas, Nevada, the Method, Decision (unanimous), and the Event, K-1 World Grand Prix 2003 in Las Vegas II?
SQL: SELECT MIN(round) FROM table_name_87 WHERE location = "las vegas, nevada" AND method = "decision (unanimous)" AND event = "k-1 world grand prix 2003 in las vegas ii"