Glendale and Seattle were the best two teams at the end of the regular season and won their respective semi-final matches to advance to the championship game at Torero Stadium in San Diego.

[2] Seattle became Major League Rugby's first champion team with a surprise come-from-behind 23–19 win in the final over Glendale, who had only lost once previously during the season.

[2] All seven participating teams played eight matches and received two rounds of byes during the regular season held over ten weeks from April through to June.

[4][5] The semifinals were played as a double header at Infinity Park in Glendale on June 30, followed a week later by the final at Torero Stadium in San Diego on July 7.

The leading scorers in 2018 over the regular season and playoffs combined were: Sources:[12][13]Americas Rugby News and MLR (archived).