what decides home field advantage for world series
World Series Beginning in 2017, home field advantage in the World Series will be awarded to the league champion team with the better regular season win-loss record.[26]If both league champions have the same record, the second tie-breaker would be head-to-head record, and if that does not resolve it, the third tie-breaker would be best divisional record.
World Series Prior to 1969, the team with the best regular season win-loss record in each league automatically advanced to the World Series; since then each league has conducted a championship series (ALCS and NLCS) preceding the World Series to determine which teams will advance. As of 2017, the World Series has been contested 113 times, with the AL winning 65 and the NL winning 48.