Major League Soccer is a men's professional soccer league sanctioned by the United States Soccer Federation which represents the sport's highest level in the United States and Canada. The league comprises 26 teams—23 in the U.S. and three in Canada—and constitutes one of the major professional sports leagues in both countries. The league will expand to 30 teams by the 2022 season. The regular season starts in late February or early March and runs through mid-October, with each team playing 34 games; the team with the best record is awarded the Supporters' Shield. Fourteen teams compete in the postseason MLS Cup Playoffs through October and November, culminating in the championship game, the MLS Cup. MLS teams also play in domestic competitions against teams from other divisions in the U.S. Open Cup and in the Canadian Championship. MLS teams also compete against continental rivals in the CONCACAF Champions League. With an average attendance of over 20,000 per game, MLS has the third-highest average attendance of any sports league in the U.S. after the National Football League and Major League Baseball, and is the seventh-highest attended professional soccer league worldwide.