Question: In which division did this team, that was defeated by the Dallas Mavericks in 6 games in the 2011 National Basketball Association (NBA) finals, finish first in the regular season?

Context paragraphs:
2014–15 NBA season: The 2014–15 NBA season was the 69th season of the National Basketball Association (NBA).  The NBA draft took place on June 26, 2014, at Barclays Center in Brooklyn, where Andrew Wiggins was selected first overall.  The regular season began on Tuesday, October 28, 2014, when the defending NBA champions San Antonio Spurs hosted the first game against the Dallas Mavericks.  Christmas games were played on Thursday, December 25, 2014.  The 2015 NBA All-Star Game was played on Sunday, February 15, 2015, at Madison Square Garden in New York City, with the West defeating the East 163-158.  Oklahoma City's Russell Westbrook won the NBA All-Star Game Most Valuable Player Award.  The regular season ended on Wednesday April 15, 2015 and the playoffs began on Saturday, April 18, 2015 and ended with the 2015 NBA Finals on June 16, 2015, after the Golden State Warriors defeated the Cleveland Cavaliers in six games to win their fourth NBA title.

2014–15 Houston Rockets season: The 2014–15 Houston Rockets season was the 48th season of the franchise in the National Basketball Association (NBA), and the 44th in the Houston area.  The Rockets finished the regular season with a 56–26 record, the third best in franchise history.  They also won their first ever Southwest Division title and first Division crown since 1994.  The Rockets beat the Dallas Mavericks 4–1 in the first round, advancing to the Western Conference Semifinals for the first time since 2009.  They beat the Los Angeles Clippers in seven games after trailing the series 1–3, advancing to the Western Conference Finals for the first time since 1997.  They became just the ninth team in NBA history to come back from such a deficit – and currently the only franchise to do so twice.  The Rockets' season ended with a 1–4 loss in the Western Conference Finals to the Golden State Warriors.

Donnie Nelson: Donn Charles Nelson (born September 10, 1962 in Iowa City, Iowa) is an American basketball executive.  He is currently the general manager and president of basketball operations for the Dallas Mavericks of National Basketball Association (NBA).  He is the son of Don Nelson, the former head coach of the Golden State Warriors and the Dallas Mavericks.  In a 2007 Sports Illustrated article ranking the NBA's personnel bosses from 1 to 30, Nelson was ranked No. 2.  In a 2009 Yahoo! Sports article Nelson was ranked the third best general manager of the decade after producing nine 50-plus win seasons in a row and the first Finals appearance in franchise history in 2006.  Nelson assembled the Mavericks team that would later win the 2011 NBA Championship.

2011–12 Miami Heat season: The 2011–12 Miami Heat season is the franchise's 24th season in the National Basketball Association (NBA).  They came into the season as the defending Eastern Conference champions, the second season playing with the "Big Three" of Dwyane Wade, LeBron James, and Chris Bosh, and the fourth season under head coach Erik Spoelstra.  Prior to the beginning of the season, they looked to bounce back from their disappointing finish to the previous year where they lost to the Dallas Mavericks in the NBA Finals.  Following the 2011 NBA lockout the Heat played only 66 games this season.  They won their division for the 9th time and appeared in the Eastern Conference Finals for the 5th time.  For the second year in a row, Dwyane Wade, LeBron James, and Chris Bosh were all selected to the NBA All-Star Game, tying the record for the most Heat players in an All-Star game in franchise history.

2010–11 Miami Heat season: The 2010–11 Miami Heat season was the 3rd season of the Miami Heat in the National Basketball Association (NBA).  In the regular season, the Heat finished first in the Southeast Division with 58–24 record, and made the NBA Playoffs for the 3rd consecutive year as the Eastern Conference's No. 2 seed (behind the Chicago Bulls).

2010–11 Dallas Mavericks season: The 2010–11 Dallas Mavericks season was the 31st season of the franchise in the National Basketball Association (NBA).  The Mavericks won the NBA Championship after defeating the Miami Heat in 6 games in the 2011 NBA Finals.  The Mavs playoff run came with a 6-game first round series against the Portland Trail Blazers, a series in which the Mavericks blew a 23-point lead in Game 4, but still won the series.  In the conference semi-finals, the Mavericks run was motivated with a sweep of the champions of the previous two seasons, the Los Angeles Lakers.  The series against the Lakers also became the birth of the Mavericks Royal Blue-Out games in the AAC, with almost all fans wearing T-shirts that read "The Time is Now".  In the Western Conference Finals against the Oklahoma City Thunder, the Mavericks won the last 3 games winning by 4th quarter comebacks, to win their second Western Conference Championship, and a trip to the NBA Finals for the first time since 2006, with a rematch against the Heat.  Following a disappointing Game 1, the Mavericks pulled the biggest comeback in NBA Finals history in Game 2 to even the series at 1 game each.  After a loss in Game 3, the Mavericks won the last two games in Dallas to take a 3–2 series lead heading to Game 6 in Miami.  The Mavericks won their first NBA Championship in Game 6 to clinch the first major sports championship in the Dallas-Fort Worth area since the Dallas Stars in 1999, and the first title in Mavericks franchise history.  The Mavericks are the third team to win an NBA title in the state of Texas, joining the Houston Rockets and San Antonio Spurs.  The Mavericks are also the third team to win a major sports championship in the Dallas-Fort Worth area, joining the Dallas Cowboys' five Super Bowl titles and the Dallas Stars' only Stanley Cup, leaving the Texas Rangers as the only team to not win a major sports title in the area, as they have not won the World Series.  The Mavericks championship parade was held on June 16, 2011 in downtown Dallas.

History of the Miami Heat: The Miami Heat is an American professional basketball team based in Miami.  The team was launched in 1988 and played in the 1988–89 season of the National Basketball Association.  The next season they moved from the Western Conference to the Atlantic Division of the Eastern Conference.  After a mainly mediocre performance in the first few seasons, there were extensive team changes in 1995 and 1996 under head coach Pat Riley, including the recruitment of Isaac Austin and P.J. Brown.  They reached the Eastern Conference Finals for the first time in 1996–97.  They did not reach this level again until 2004–05, under new head coach Stan Van Gundy and with Dwyane Wade as a leading team member.  At this time they transferred to the Southeast Division.  The next year the team won the NBA Finals, defeating the Dallas Mavericks.  The head coach position was next taken by Erik Spoelstra.  Their next successful season was 2010–11, when they reached the NBA Finals again, losing to the Mavericks.  Acquiring LeBron James as a player, they won the Finals in both 2012 and 2013, and won 27 successive games in February–March 2013.  In 2013–14 they reached the Finals again but lost to San Antonio Spurs.  James left the team in July 2014, and the 2014–15 season was less successful.

2011 NBA Finals: The 2011 NBA Finals was the championship series of the National Basketball Association (NBA)'s 2010–11 season, and the conclusion of the season's playoffs.  The Western Conference champion Dallas Mavericks defeated the Eastern Conference champion Miami Heat 4 games to 2 to win their first NBA championship.  Dallas became the last NBA team from Texas to win its first title, after the Houston Rockets won back-to-back titles in and , and the San Antonio Spurs won four NBA championships in , , and , and a fifth one subsequently in ; all three Texas NBA teams have now won at least one NBA championship.  It was also the first time in four years that the Los Angeles Lakers did not make the Finals, having been swept in the Western Conference semifinals by the eventual champion Dallas Mavericks.

NBA Conference Finals: The National Basketball Association Conference Finals are the Eastern and Western championship series of the National Basketball Association (NBA), a major professional basketball league in North America.  The NBA was founded in 1946 as the Basketball Association of America (BAA).  The NBA adopted its current name at the start of the 1949–50 season when the BAA merged with the National Basketball League (NBL).  The league currently consists of 30 teams, of which 29 are located in the United States and 1 in Canada.  Each team plays 82 games in the regular season.  After the regular season, eight teams from each of the league's two conferences qualify for the playoffs.  At the end of the playoffs, the top two teams play each other in the Conference Finals, to determine the Conference Champions from each side, who then proceed to play in the NBA Finals.

2005–06 Dallas Mavericks season: The 2005–06 Dallas Mavericks season was the 26th season of the franchise in the National Basketball Association (NBA).  The season saw Dallas go to the NBA Finals for the first time in franchise history.  However, it was not to be as they lost to the Miami Heat, who were led by Shaquille O'Neal and Dwyane Wade, in six games.  Dallas and Miami would meet again in the 2011 NBA Finals, where the Mavericks would get revenge, defeating the favored Heat in six games to win their first ever NBA championship; teammates Dirk Nowitzki and Jason Terry are the only members of both 2006 and 2011 Finals teams.

Supporting paragraphs: 2010–11 Dallas Mavericks season 2010–11 Miami Heat season
Answer: Southeast Division