Bianca Sierra

National Women's Soccer League

Sierra was not among the 36 college soccer players drafted by the NWSL in January 2014. She showed up at tryouts for the Washington Spirit, played in several pre-season games, and was signed to a contract for the 2014 season on 4 April 2014. On 18 June 2014, the Washington Spirit traded Sierra to the Boston Breakers in exchange for forward and Australian international Lisa De Vanna and an international roster spot until the end of the 2014 NWSL season.

Toppserien

Sierra joined the first division Norwegian club Arna-Bjørnar in March 2016.

Úrvalsdeild

Sierra signed for Icelandic Úrvalsdeild kvenna team Þór/KA in March 2017. She played 18 games during the 2017 Úrvalsdeild kvenna season, scoring two goals and helping the club to the national championship. In November 2017, Sierra signed with Þór/KA again for the 2018 season.

Bianca Sierra is the daughter of Alberto Sierra and Rosa García. They manage several Mexican restaurants in the San Francisco Bay Area. Sierra played forward, midfield, and centerback in high school from her freshman through junior years and with the Mustang Spirit, a girl's club team, in 2009.

In June 2016, Sierra announced publicly she was in a relationship with fellow Mexico women's national teammate Stephany Mayor. Sierra and Mayor are believed to be the first openly gay athletes in Mexico history. In 2015, Mexican coach, Leonardo Cuellar, had warned Sierra and Mayor to avoid any "stunts" or "holding hands." In 2016, Mayor was not selected by Cuellar to play for the Mexico national team and Sierra declined to play on the national team. Mayor departed Mexico to play in Iceland. Sierra later joined her in Iceland. Mayor rejoined the Mexico national team, under new coach Roberto Medina, for a match against Venezuela on 10 June 2017. Sierra rejoined the national team shortly thereafter.