Analysis of information sources in references of the Wikipedia article "1968 Philadelphia Phillies season" in English language version.
All other Tuesday openers in the major leagues have been postponed. ... In addition, all of Sunday's exhibition finales, with the exception of the Dodgers-Indians game at San Diego, Calif., were cancelled at [sic] the sports world joined in a national day of mourning for King.
Dr. King's death resulted in the postponement of the Monday games and the entire slate of Tuesday's openers. It still is touch and go as to whether some of the games will be played Wednesday in cities that have been torn by riots.
The postponement was unparalleled in baseball history, a tribute not even accorded President Franklin D. Roosevelt, who died a few days before the 1945 season began.