Title: List of World Series champions
Content:  Texas Rangers, Tampa Bay Rays, and Milwaukee Brewers have all played in the Series but have never won it. The Los Angeles Angels, Arizona Diamondbacks and Washington Nationals are the only teams who have won their only World Series appearance, and the Toronto Blue Jays and the Miami Marlins have won both of their World Series appearances. The Toronto Blue Jays are the only franchise from outside the United States to appear in and win a World Series, winning in 1992 and 1993. The Houston Astros are the only franchise to have represented both the NL (2005) and the AL (2017, 2019, 2021), winning the Series in 2017. The current (2021) World Series champions are the Atlanta Braves.
Title: World Series
Content:  Arizona Diamondbacks (2001), the Los Angeles Angels (2002 as the Anaheim Angels) and the Washington Nationals (2019) have never lost a World Series appearance. ; 7) Five expansion teams have appeared in the World Series without ever winning a championship: twice each for the Texas Rangers (formerly the second Washington Senators), San Diego Padres, and Tampa Bay Rays (formerly Devil Rays), and once each for the Milwaukee Brewers (formerly Seattle Pilots) and Colorado Rockies. ; 8) One expansion team has not yet won a league pennant (and therefore has also not appeared in a World Series): the American League's Seattle Mariners. 
Title: World Series
Content:  (1992 and 1993) and National League's Miami Marlins (1997 and 2003 as the Florida Marlins) hold the record for most appearances without ever losing a Series. Three other franchises have won their lone appearance: the National League's Arizona Diamondbacks (2001) and Washington Nationals (2019) and the American League's Los Angeles Angels (2002 as the Anaheim Angels). ; The Boston Red Sox have the longest active streak of World Series victories (four) since the last time they lost a series. They have won titles in 2004, 2007, 2013 and 2018 after their last loss in 1986. ; The Pittsburgh Pirates, San Francisco Giants, and Cincinnati Reds have the longest 
Title: World Series
Content: 1) Three World Series have featured teams with identical regular-season records (1949, 1958, 2013). In the remaining 113 Series, the team with the better regular-season winning percentage has won the World Series 55 times, or 48.67% (54 of 113) of the time. ; 2) The Toronto Blue Jays are the only Canadian team to win a pennant or a World Series, doing both feats twice, in 1992 and 1993. ; 3) The Chicago Cubs, the Houston Astros and the Washington Nationals are the only teams with a World Series title that have never clinched one at home. ; 4) The Washington Senators/Minnesota Twins, New York Mets, 
Title: World Series
Content:  of the fortunes of several teams. The two most prolific World Series winners to date, the New York Yankees and the St. Louis Cardinals, did not win their first championship until the 1920s; and three of the teams that were highly successful prior to 1920 (the Boston Red Sox, Chicago White Sox and the Chicago Cubs) went the rest of the 20th century without another World Series win. The Red Sox and White Sox finally won again in 2004 and 2005, respectively. The Cubs had to wait over a century (until the 2016 season) for their next trophy. They did not appear in the Fall Classic from 1945 until 2016, the longest drought of any MLB club.
Title: World Series
Content:  least one World Series to six of the original NL teams, never losing to the Chicago Cubs or the Philadelphia Phillies. The Boston Red Sox have played at least one Series against seven original National League teams, missing only the Boston/Milwaukee/Atlanta Braves, with whom they shared a home city through 1952. The Brooklyn/Los Angeles Dodgers have faced seven original teams of the American League in the World Series, missing only the Detroit Tigers. ; 5) The St. Louis Cardinals are currently the only club of the National League's original eight that holds an overall Series lead over the Yankees, 3 to 
Title: World Series
Content:  Pittsburgh Pirates, who have not played in a World Series since winning it in 1979.  This also means that the Pirates hold the second-longest active World Series title drought among all teams that have at least one Series and longest championship drought among NL teams that have won a Series. ; Twenty-four of the 29 teams who have played in the World Series have won it at least once. The only exceptions are the Milwaukee Brewers (formerly Seattle Pilots), San Diego Padres, Colorado Rockies, Tampa Bay Rays (formerly Devil Rays), and Texas Rangers (formerly Washington Senators). The Padres, Rangers, and Rays have each lost two World Series; the 
Title: World Series
Content: 1) The Braves are the only team to have both won and lost a World Series in three home cities (Boston, Milwaukee, and Atlanta). ; 2) The Athletics have had three home cities (Philadelphia, Kansas City, and Oakland), but have appeared in the World Series (both winning and losing) while based in only two of them (Philadelphia and Oakland). ; 3) Three other teams have both won and lost the Fall Classic in two home cities: The Dodgers (Brooklyn and Los Angeles), the Giants (New York and San Francisco), and the Twins (Washington, as the first Senators and Minneapolis). ; 4) The Orioles are the only other team to have played in the World Series in two home cities (St. Louis, as the Browns and Baltimore), but all three of their titles (and three of their four losses) have come while based in Baltimore. 
Title: World Series
Content:  Series appearances in 1998 and 1999, and then won the first two games of the 2000 World Series before losing the third game of that Series to the New York Mets. ; The only team to have appeared in a World Series and have no World Series game victories is the Colorado Rockies, who were swept in their only appearance to date in 2007. ; Nine World Series have ended with "walk-off" hits, i.e., that game and the Series ended when the home team won with a base hit in the bottom of the ninth or in extra innings: 1924*, 1929, 1935, 1953, 
Title: World Series
Content:  and Rockies have both lost one Series.  As of 2019, every team that has appeared in at least three World Series has won at least one title. ; Only one team has never played in the World Series: the American League's Seattle Mariners. The Mariners have competed in the American League Championship Series three times (in 1995, 2000, and 2001), but lost all three. ; The Boston Red Sox have the most World Series titles before their first World Series loss, winning the championship in their first five appearances—1903, 1912, 1915, 1916, and 1918—before losing the next series they played, in 1946. ; The American League's Toronto Blue 

Question: baseball teams who have not won a world series?
Answer: Washington Nationals.
Tampa Bay Rays.
San Diego Padres.
Milwaukee Brewers.
Seattle Mariners.
Texas Rangers.
Colorado Rockies.