Question: Who's the opponent of Mark Ross's team in the world series last year?

full_context: Document 1: Ron Davis (outfielder): Ronald Everette Davis (October 21, 1941 – September 5, 1992) was an American professional baseball outfielder. He played in Major League Baseball (MLB) from 1962 and 1966 to 1969 for the Houston Colt .45s, Houston Astros, St. Louis Cardinals, and Pittsburgh Pirates.
Document 2: Houston Astros: Houston Astros 2017 Houston Astros season Established in 1962 Team logo Cap insignia Major league affiliations American League (2013 -- present) West Division (2013 -- present) National League (1962 -- 2012) Central Division (1994 -- 2012) West Division (1969 -- 1993) Current uniform Retired numbers 5 7 24 25 32 33 34 40 49 42 Colors Navy blue, orange, white Name Houston Astros (1965 -- present) Houston Colt. 45s (1962 -- 1964) Other nicknames' Stros Ballpark Minute Maid Park (2000 -- present) Astrodome (1965 -- 1999) Colt Stadium (1962 -- 1964) Major league titles World Series titles (1) 2017 AL Pennants (1) 2017 NL Pennants (1) 2005 AL West Division titles (1) 2017 NL West / Central Division titles (6) 1980 1986 1997 1998 1999 2001 Wild card berths (3) 2005 2015 The Astros also qualified for the postseason in the strike - split 1981 season, losing to the Los Angeles Dodgers in the NLDS. Front office Owner (s) Jim Crane Manager A.J. Hinch General Manager Jeff Luhnow President of Baseball Operations Reid Ryan
Document 3: José Herrera (1960s outfielder): Herrera was signed by the Houston Colt .45s as an amateur free agent and made his debut with the team after it became the Astros.
Document 4: World Series Most Valuable Player Award: The series follows a best - of - seven playoff format, and occurs after the Division Series and the League Championship Series (LCS). It is played by the winners of the National League Championship Series (NLCS) and the American League Championship Series (ALCS). The most recent champions are the Houston Astros, who won in the 2017 World Series.
Document 5: 2017 American League Championship Series: 2017 American League Championship Series Teams Team (Wins) Manager Season Houston Astros (4) A.J. Hinch 101 -- 61 (. 623), 21 GA New York Yankees (3) Joe Girardi 91 -- 71 (. 562), 2 GB Dates October 13 -- 21 MVP Justin Verlander (Houston) Umpires Mark Carlson (Games 3 -- 7), Gary Cederstrom (crew chief), Chad Fairchild (Games 1 -- 2), Chris Guccione, Jerry Meals, Jim Reynolds, Hunter Wendelstedt ALDS New York Yankees defeated Cleveland Indians (3 -- 2) Houston Astros defeated Boston Red Sox (3 -- 1) Broadcast Television FS1 (Games 1, 3 -- 7) Fox (Game 2) TV announcers Joe Buck, John Smoltz, Ken Rosenthal, and Tom Verducci Radio ESPN Radio announcers Jon Sciambi and Chris Singleton ← 2016 ALCS 2017 World Series
Document 6: Mark Ross: Ross was originally drafted by the Houston Astros in the 7th round of the 1979 Major League Baseball Draft. After three years in their farm system, he earned a call-up in September 1982, pitching six innings over four games. He remained with the Houston organization through the end of the 1986 season, with two additional brief stints with the Astros in 1984 and 1985.
Document 7: Houston: Houston has sports teams for every major professional league except the National Hockey League (NHL). The Houston Astros are a Major League Baseball (MLB) expansion team formed in 1962 (known as the "Colt .45s" until 1965) that made one World Series appearance in 2005. The Houston Rockets are a National Basketball Association (NBA) franchise based in the city since 1971. They have won two NBA Championships: in 1994 and 1995 under star players Hakeem Olajuwon, Otis Thorpe, Clyde Drexler, Vernon Maxwell, and Kenny Smith. The Houston Texans are a National Football League (NFL) expansion team formed in 2002. The Houston Dynamo are a Major League Soccer (MLS) franchise that has been based in Houston since 2006 after they won two MLS Cup titles in 2006 and 2007. The Houston Dash play in the National Women's Soccer League (NWSL). The Scrap Yard Dawgs, a women's pro softball team, is expected to play in the National Pro Fastpitch (NPF) from 2016.
Document 8: 2017 World Series: The 2017 World Series was the championship series of Major League Baseball's (MLB) 2017 season. The 113th edition of the World Series was played between October 24 and November 1. It was a best - of - seven playoff between the National League (NL) champion Los Angeles Dodgers and the American League (AL) champion Houston Astros. It was sponsored by the internet television service YouTube TV and officially known as the World Series presented by YouTube TV.
Document 9: Houston Astros: The Astros clinched their first division title as a member of the American League West division, and first division title overall since 2001. They also became the first team in Major League history to win three different divisions, the National League West in 1980 and 1986, the National League Central from 1997 -- 1999 and 2001, and now the American League West in 2017. On September 29, the Astros won their 100th game of the season, the second time the Astros finished a season with over 100 wins (the other time was in 1998). They finished 101 -- 61 (with a 21 - game lead in the division), and faced the Red Sox in the second round of the AL playoffs. The Astros defeated the Red Sox three games to one, and advanced to the American League Championship Series against the New York Yankees. The Astros won the ALCS four games to three, and advanced to the World Series to play against the Los Angeles Dodgers. The Astros defeated the Dodgers in the deciding seventh game of the World Series, winning the first championship in franchise history.
Document 10: 2017 World Series: 2017 World Series Team (Wins) Manager (s) Season Houston Astros (4) A.J. Hinch 101 -- 61 (. 623) Los Angeles Dodgers (3) Dave Roberts 104 -- 58 (. 642) Dates October 24 -- November 1 MVP George Springer (Houston) Umpires Phil Cuzzi (Games 1 -- 2), Gerry Davis (crew chief), Laz Díaz, Dan Iassogna, Bill Miller, Paul Nauert, Mark Wegner (Games 3 -- 7) ALCS Houston Astros defeated New York Yankees, 4 -- 3 NLCS Los Angeles Dodgers defeated Chicago Cubs, 4 -- 1 Broadcast Television Fox Fox Deportes MLB International TV announcers Joe Buck, John Smoltz, Ken Rosenthal, and Tom Verducci (Fox) Rolando Nichols, Carlos Álvarez, Edgar Gonzalez, and Jaime Motta (Fox Deportes) Matt Vasgersian and Buck Martinez (MLB International) Radio ESPN Radio ESPN Deportes Radio Sportstalk 790 (HOU -- English) FM 94.1 HD3 (HOU -- Spanish) AM 570 LA Sports (LAD -- English) Univision America 1020 (LAD -- Spanish) Radio Korea 1540 (LAD -- Korean) Radio announcers Dan Shulman and Aaron Boone (ESPN) Eduardo Ortega, Renato Bermúdez, José Francisco Rivera, and Orlando Hernández (ESPN Deportes) Robert Ford and Steve Sparks (HOU -- English) Alex Treviño and Francisco Romero (HOU -- Spanish) Charley Steiner and Rick Monday (LAD -- English) Jaime Jarrín and Jorge Jarrín (LAD -- Spanish) Richard Choi and Chong Ho Yim (LAD -- Korean) World Series Program ← 2016 World Series 2018 →
Document 11: Eric Anthony: Drafted by the Houston Astros in the 34th round of the 1986 MLB amateur draft, Anthony would make his Major League Baseball debut with the Houston Astros on July 28, 1989, and appear in his final game on September 27, 1997.
Document 12: Roy Oswalt: Roy Oswalt (; born August 29, 1977) is a former American professional baseball pitcher who played for the majority of his career with the Houston Astros. He also played for the Philadelphia Phillies, the Texas Rangers, and the Colorado Rockies.
Document 13: 2017 World Series: The 2017 World Series was the championship series of Major League Baseball's (MLB) 2017 season. The 113th edition of the World Series, it was played between October 24 and November 1. The series was a best - of - seven playoff between the National League (NL) champion Los Angeles Dodgers and the American League (AL) champion Houston Astros. It was sponsored by the Internet television service YouTube TV and officially known as the World Series presented by YouTube TV.
Document 14: 2017 World Series: 2017 World Series Team (Wins) Manager (s) Season Houston Astros (4) A.J. Hinch 101 -- 61 (. 623) Los Angeles Dodgers (3) Dave Roberts 104 -- 58 (. 642) Dates October 24 -- November 1 MVP George Springer (Houston) Umpires Phil Cuzzi (Games 1 -- 2), Gerry Davis (crew chief), Laz Díaz, Dan Iassogna, Bill Miller, Paul Nauert, Mark Wegner (Games 3 -- 7) ALCS Houston Astros defeated New York Yankees, 4 -- 3 NLCS Los Angeles Dodgers defeated Chicago Cubs, 4 -- 1 Broadcast Television Fox Fox Deportes MLB International TV announcers Joe Buck, John Smoltz, Ken Rosenthal, and Tom Verducci (Fox) Rolando Nichols, Carlos Álvarez, Edgar Gonzalez, and Jaime Motta (Fox Deportes) Matt Vasgersian and Buck Martinez (MLB International) Radio ESPN Radio ESPN Deportes Radio Sportstalk 790 (HOU -- English) FM 94.1 HD3 (HOU -- Spanish) AM 570 LA Sports (LAD -- English) Univision America 1020 (LAD -- Spanish) Radio Korea 1540 (LAD -- Korean) Radio announcers Dan Shulman and Aaron Boone (ESPN) Eduardo Ortega, Renato Bermúdez, José Francisco Rivera, and Orlando Hernández (ESPN Deportes) Robert Ford and Steve Sparks (HOU -- English) Alex Treviño and Francisco Romero (HOU -- Spanish) Charley Steiner and Rick Monday (LAD -- English) Jaime Jarrín and Jorge Jarrín (LAD -- Spanish) Richard Choi and Chong Ho Yim (LAD -- Korean) World Series Program ← 2016 World Series
Document 15: 2017 Major League Baseball season: The 2017 Major League Baseball season began on April 2, 2017 with three games, including the 2016 World Series champions Chicago Cubs facing off against the St. Louis Cardinals, and ended on October 1. The postseason began on October 3. The 2017 World Series began October 24 and Game 7 was played on November 1, in which the Houston Astros defeated the Los Angeles Dodgers, 5 - 1, to capture their first World Series championship in franchise history.
ground_truth: Los Angeles Dodgers
sub_queries: Mark Ross >> member of sports team Answer: Houston Astros
who did the Houston Astros play in the world series last year Answer: Los Angeles Dodgers