when the number of clubs in the league needs to be filled with clubs from the Japanese Regional Leagues. Mexico Mexico's top flight league, Liga MX, is contested annually by 18 teams. In each of two annual tournaments, every team plays every other team in the league once (17 games), after which the top eight teams advance to the Liguilla. In the Liguilla, all rounds are home-and-away. Teams are drawn so the best team plays the worst, the second-best plays the second-worst, and so on. After one round, the teams are redrawn so the best remaining team again plays the worst remaining one and the second-best faces the second-worst in the semi-finals. The two winners of this round play each other for the championship. There is no playoff between the Apertura and Clausura winner. As a result, the league crowns two champions each year. After each Clausura, the team with the lowest points-per-game total for the previous six tournaments (three years, counting only Liga MX games) is relegated to Ascenso MX to be replaced by that league's champion (if eligible). Netherlands In the Netherlands, a playoff was introduced in the 2005–06 season. It is used to determine which teams from the Eredivisie qualify for European football. The playoff system has been criticized by clubs, players and fans as the number of matches will increase. Under the original playoff format, it was possible, though thoroughly unlikely, that the runner-up would not qualify for Europe; the following year, the format was changed so that the second-place team was assured of no worse than a UEFA Cup berth. Starting in 2008–09, the format was changed yet again. The champion goes directly to the Champions League; the runner-up enters the second qualification round of the CL; the number three enters the fourth (and last) qualification round of the UEFA Europa League (EL; the new name of the UEFA Cup from 2009 to 2010 onward) and the number four goes to the third qualification round of the EL. The only play-off will be for the clubs placed 5th through 8th. The winner of that play-off receives a ticket for the second qualification round of the EL. Playoffs are also part of the promotion and relegation structure between the Eredivisie and the Eerste Divisie, the two highest football leagues in the Netherlands. Philippines The Philippines Football League (PFL) adopted a playoffs for its inaugural 2017 season.