Hideki Okajima (岡島 秀樹 , Okajima Hideki , born December 25, 1975) is a former Japanese professional baseball pitcher.
 Okajima has pitched for the Yomiuri Giants, Hokkaido Nippon-Ham Fighters, Fukuoka SoftBank Hawks, and Yokohama DeNA BayStars of Nippon Professional Baseball, and the Boston Red Sox and Oakland Athletics of Major League Baseball.
 Okajima was elected to the 2007 Major League Baseball All-Star Game as a first time All-Star via the All-Star Final Vote.
 He became the first Japanese-born pitcher to play in the World Series in Game 2 of the 2007 World Series.
 On July 18, 2016, Okajima announced his retirement.
The 1987 World Series was the 84th edition of Major League Baseball's championship series, and the conclusion of the 1987 Major League Baseball season.
 It was a best-of-seven playoff played between the American League (AL) champion Minnesota Twins and the National League (NL) champion St. Louis Cardinals.
 The Twins defeated the Cardinals four games to three to win the Series.
 Twins pitcher Frank Viola was named as the 1987 World Series MVP.
Chin-Hui Tsao (; born June 2, 1981) is a Taiwanese former professional baseball pitcher.
 He is the second major league player and the first major league pitcher from Taiwan, and like the first, former Los Angeles Dodgers outfielder Chin-Feng Chen, he is a Taiwanese aborigine of Amis ancestry.
 He had previously played in Major League Baseball (MLB) for the Colorado Rockies and Dodgers before spending the 2009 season with the Brother Elephants in the Chinese Professional Baseball League (CPBL).
 After the 2009 Taiwan Series, Tsao was investigated for game-fixing scandals, although he was ultimately not indicted on February 10, 2010.
 Tsao was expelled by CPBL on December 23, 2009.
 He has recorded the fastest pitch by a Taiwanese pitcher at 100 mph in 2005.
Wade Allen Davis (born September 7, 1985) is an American professional baseball pitcher for the Chicago Cubs of Major League Baseball (MLB).
 He previously played for the Tampa Bay Rays and Kansas City Royals.
 Davis is a three-time MLB All-Star.
 He was a member of the Royals' 2015 World Series-winning team, and earned the Babe Ruth Award for his performance in the 2015 MLB postseason.
Andrew Mark Miller (born May 21, 1985) is an American professional baseball relief pitcher for the Cleveland Indians of Major League Baseball (MLB).
 He previously played for the Detroit Tigers, Florida Marlins, Boston Red Sox, Baltimore Orioles, and New York Yankees.
 In 2017, he earned his first major championship in the World Baseball Classic as a member of the United States national baseball team.
 Miller attended the University of North Carolina (UNC) at Chapel Hill and played college baseball for the Tar Heels before the Detroit Tigers drafted him.
 After beginning his MLB career primarily as a starting pitcher, Miller converted to full-time relief in 2012, serving in middle relief, setup and closer roles.
 He has pitched in three playoffs while his clubs have appeared in five.
 At UNC, he won the "Baseball America" College Player of the Year and Roger Clemens Awards.
 In his Major League career, he has been an All-Star selection, and has won the American League (AL) Reliever of the Year and the AL Championship Series Most Valuable Player Awards (ALCS MVP).
Chan Ho Park (Korean: 박찬호 ; ] ; born June 30, 1973) is a South Korean former professional baseball pitcher.
 He played for the Los Angeles Dodgers, Texas Rangers, San Diego Padres, New York Mets, Philadelphia Phillies, New York Yankees, and Pittsburgh Pirates of Major League Baseball (MLB), the Orix Buffaloes of Nippon Professional Baseball (NPB), and the Hanwha Eagles of the KBO League.
 He was the first South Korean-born player in major league history.
 Park has the most career wins, 124, of any Asian-born pitcher in history.
 He passed Hideo Nomo for the most ever by an Asian-born pitcher in 2010.
 He is 6'2" (188 cm) tall and weighs 210 lbs (95 kg).
Aaron Daniel Blair (born May 26, 1992) is an American professional baseball pitcher for the Atlanta Braves of Major League Baseball (MLB).
 Blair attended Marshall University, where he played baseball for the Marshall Thundering Herd baseball team.
 Prior to that, he attended Spring Valley High School in Spring Valley, Nevada and played for the school's baseball team.
 The Houston Astros selected him in the 21st round of the 2010 Major League Baseball Draft but decided to go to college instead.
 The Arizona Diamondbacks selected Blair with the 36th pick of the 2013 Major League Baseball Draft.
 He was traded to the Atlanta Braves by the Diamondbacks as part of a five-player deal announced December 9, 2015.
Danny Bradford Cox (born September 21, 1959) is a former Major League Baseball pitcher.
 He pitched for the St. Louis Cardinals from 1983 to 1988, the Philadelphia Phillies from 1991 to 1992, the Pittsburgh Pirates in 1992, and then the Toronto Blue Jays from 1993 to 1995, when he retired.
 Over his eleven-year career, Cox won 74, lost 75, recorded a 3.64 ERA, 21 complete games, 5 shutouts and 8 saves.
 He won Game 3 of the 1985 National League Championship Series with the Cardinals trailing 2 games to none.
 Cox pitched well in the 1985 World Series, but earned two no-decisions.
 He pitched a shutout in Game 7 of the 1987 National League Championship Series, and was the winning pitcher in Game 5 of the 1987 World Series, making Cox only the third European born pitcher to start a World Series game.
The World Series, the modern championship series of Major League Baseball, began in 1903, and was established as an annual event in 1905.
 Before the formation of the American Association (AA), there were no playoff rounds—all championships went to the team with the best record at the end of the season.
 In the initial season of the National League (NL) in 1876, there was controversy as to which team was the champion: the Chicago White Stockings, who had the best overall record (52–14), or the St. Louis Brown Stockings (45–19), who were the only team to have a winning record against every other franchise in the league.
 The teams agreed to play a five-game "Championship of the West" series, won by St. Louis, 4 games to 1.
 Beginning in 1884, the championship series between the National League and the American Association were promoted and referred to as the "World's Championship Series" (WCS), or "World's Series" for short; however, they are not officially recognized by Major League Baseball as part of World Series history.
 Though early publications, such as Ernest Lanigan's "Baseball Cyclopedia" and Turkin and Thompson's "Encyclopedia of Baseball", listed the 19th-century games on an equal basis with those of the 20th century, "Sporting News" publications about the World Series, which began in the 1920s, ignored the 19th-century games, as did most publications about the Series after 1960.
 Major League Baseball, in general, regards 19th-century events as a prologue to the modern era of baseball, which is defined by the emergence of the two present major leagues.
The 2015 World Series was the 111th edition of Major League Baseball's championship series, a best-of-seven playoff between the National League (NL) champion New York Mets and the American League (AL) champion Kansas City Royals.
 The series was played between October 27 and November 1, with the Royals winning the series 4 games to 1.
 It was the first time since the 2010 World Series that the World Series extended into November.
 The Royals became the first team since the Oakland Athletics in the 1989 World Series to win the World Series after losing in the previous year.
 It was also the first World Series since the 2007 World Series to not feature the Philadelphia Phillies, St. Louis Cardinals, or San Francisco Giants as the NL champions.

Question: What nationality was the professional baseball pitcher who was in the 111th edition of Major League Baseball's championship series
Answer: American