Question: When is the opening day of the season of the league that Jim Wilson's team plays for?

Knowledge 1: Jim Wilson (first baseman)
He was released by the Indians following the 1986 season. After a brief tour in the Minnesota Twins organization, Wilson signed as a free agent with the Seattle Mariners on March 1, 1988, playing five games for them in the 1989 season. [SEP] Knowledge 2: Cleveland Indians
The Cleveland Indians are an American professional baseball team based in Cleveland, Ohio. The Indians compete in Major League Baseball (MLB) as a member club of the American League (AL) Central division. Since , they have played at Progressive Field. The team's spring training facility is at Goodyear Ballpark in Goodyear, Arizona. Since their establishment as a major league franchise in 1901, the Indians have won two World Series championships: in 1920 and 1948, along with 10 Central Division titles and six American League pennants. The Indians' current World Series championship drought is the longest active drought among all 30 current Major League teams. [SEP] Knowledge 3: Opening Day
Major League Baseball had most of its teams open the 2011 season on a Thursday (March 31) or Friday (April 1) rather than the traditional Monday, in order to prevent the World Series from extending into November. Similarly, most teams opened the 2012 season on Thursday (April 5) or Friday (April 6). However, subsequent seasons through 2017 returned to Monday openers for most teams. For the 2018 season, all 30 teams were scheduled to open the season on Thursday, March 29 (the earliest domestic start for a regular season in MLB history, and the first time since 1968 that all major league teams were scheduled to start the season on the same day, although two games were subsequently rained out and postponed to Friday, March 30).
Knowledge 1: Jim Wilson (first baseman)
He was released by the Indians following the 1986 season. After a brief tour in the Minnesota Twins organization, Wilson signed as a free agent with the Seattle Mariners on March 1, 1988, playing five games for them in the 1989 season. [SEP] Knowledge 2: Cleveland Indians
The Cleveland Indians are an American professional baseball team based in Cleveland, Ohio. The Indians compete in Major League Baseball (MLB) as a member club of the American League (AL) Central division. Since , they have played at Progressive Field. The team's spring training facility is at Goodyear Ballpark in Goodyear, Arizona. Since their establishment as a major league franchise in 1901, the Indians have won two World Series championships: in 1920 and 1948, along with 10 Central Division titles and six American League pennants. The Indians' current World Series championship drought is the longest active drought among all 30 current Major League teams. [SEP] Knowledge 3: Major League Baseball schedule
The Major League Baseball (MLB) season schedule consists of 162 games for each of the 30 teams in the American League (AL) and National League (NL), played over approximately six months -- a total of 2,430 games, plus the postseason. The regular season runs from late March / early April to late September / early October, followed by the postseason which can run to early November. The season begins with the official Opening Day, and, as of 2018, runs 261⁄2 weeks through the last Sunday of September or first Sunday of October. One or more International Opener games may be scheduled outside the United States before the official Opening Day. It is possible for a given team to play a maximum of 20 games in the postseason in a given year, provided the team is a wild card and advances to each of the Division Series, Championship Series, and World Series with each series going the distance (5 games in the Division Series, 7 games in the League Championship Series / World Series).
Knowledge 1: Jim Wilson (first baseman)
He was released by the Indians following the 1986 season. After a brief tour in the Minnesota Twins organization, Wilson signed as a free agent with the Seattle Mariners on March 1, 1988, playing five games for them in the 1989 season. [SEP] Knowledge 2: Cleveland Bulldogs
The Cleveland Bulldogs were a team that played in Cleveland, Ohio in the National Football League. They were originally called the Indians in 1923, not to be confused with the Cleveland Indians NFL franchise in 1922. However, after team owner Samuel Deutsch purchased the Canton Bulldogs in 1924, he merged the Canton team with his Indians and renamed his franchise the Cleveland Bulldogs. The Canton Bulldogs remained a part of the team until 1925, when they were sold back to Canton. The Cleveland Bulldogs played in the NFL until 1928 when they were relocated to Detroit and became the Detroit Wolverines. The team was later incorporated into the New York Giants in 1929. The Cleveland Bulldogs won the 1924 NFL championship. [SEP] Knowledge 3: NFL regular season
From 1961 through 1977, the NFL schedule consisted of fourteen regular season games played over fourteen weeks, except in 1966. Opening weekend typically was the weekend after Labor Day, or rarely two weekends after Labor Day. Teams played six or seven exhibition games. In 1966 (and 1960), the NFL had an odd number of franchises, so one team was idle each week. In 1978, the league changed the schedule to include sixteen regular season games and four exhibition games. From 1978 through 1989, the sixteen games were played over sixteen weeks.

Answer: March 29, 2018