Ona Batlle Pascual was born on 10 June 1999 in Vilassar de Mar, a town in the province of Barcelona, and started to play football with Vilassar de Mar. In 2011, she was scouted by FC Barcelona during a match with the Catalonia under-12 team. She joined FC Barcelona's youth program La Masia and progressed through the ranks, earning promotion to Barcelona B, Barcelona's highest-level youth team which played in the Segunda División, in 2014. On 9 November 2016, Batlle was called up to the first team and was an unused substitute in Barcelona's Champions League game against FC Twente. In the summer of 2017, Barcelona changed focus to recruiting high profile senior players, making it more difficult for youth players to break through to the first team. Batlle was one of seven La Masia players to leave in the summer to pursue senior first-team opportunities with other clubs. On her departure, Batlle remarked she will not rule out a return to the club that "formed her."
Batlle signed to Madrid CFF in July 2017, the club's first signing following their promotion to the Primera División. She made her senior debut during the club's first Primera División match, as a halftime substitute for Laura del Río in a 1–1 draw with Levante. Batlle cemented her place as a starter during the season, playing in 28 of the 30 league matches including 26 starts as Madrid CFF ended their first Primera División campaign mid-table in tenth place.
Levante
After one season with Madrid, Batlle signed with Levante in June 2018. However, prior to the start of the season Batlle suffered an injury at the FIFA U-20 World Cup in August, delaying her debut for the club. She eventually made her first Levante appearance as a substitute in a 3–2 win away to former club Madrid CFF on 5 December2018. Batlle scored her first Primera División goal in a 4–2 win over Logroño on 22 December 2018. On 24 June 2020, Batlle released a statement that she was not going to renew her contract with Levante and would instead become a free agent. She remained as one of 17 players in a class action lawsuit against the Association of Women's Football Clubs and the Association of Spanish Football Players at the time, disputing the use of the Compensation List that would inflate the fee necessary for other Primera División to sign allocated players as free agents. Batlle's compensation was set at €500,000.
Manchester United
On 13 July 2020, Batlle signed a two-year contract with an option for a third with English FA WSL club Manchester United.
International career
Youth
Batlle has represented Spain at under-17, under-19 and under-20 level including at five major youth tournaments: two UEFA Women's Under-17 Championship editions, the 2016 FIFA U-17 Women's World Cup, the 2017 UEFA Women's Under-19 Championship and the 2018 FIFA U-20 Women's World Cup. Spain won the 2015 UEFA Women's Under-17 Championship, beating Switzerland 5–2 in the final. Batlle started in four of the five games in the tournament. They finished as runners-up at the 2016 edition, losing to Germany on penalties in the final. Batlle started every game for Spain at the tournament. The result automatically qualifying Spain for the 2016 FIFA U-17 Women's World Cup. Batlle started five of the six games including all of the knockout round as Spain finished third, losing to Japan in the semi-finals before beating Venezuela in the third-place playoff. In July 2017, Batlle was selected by Pedro López to represent Spain at the 2017 UEFA Women's Under-19 Championship. Spain won the tournament with a stoppage time goal from Patricia Guijarro against France. Batlle again started every game in the tournament and she was on of seven Spanish players selected to the team of the tournament. The result also qualified Spain for the 2018 FIFA U-20 Women's World Cup. Batlle only ended up playing one match at the World Cup, sustaining an injury against Paraguay in the opening match that ended her tournament. Teammate Patricia Guijarro dedicated her goal against the United States to Batlle by holding up her shirt to the camera and the fans. Spain finished as runners-up, losing 3–1 to Japan in the final.
Senior
On 17 May 2019, Batlle made her senior debut in a friendly against Cameroon, substituting in for Eunate Arraiza at halftime. She was left out of the 23-player roster for the 2019 FIFA Women's World Cup three days later. In February 2020, Batlle was called up to Spain's squad for her first senior international tournament opportunity, the 2020 SheBelieves Cup. She started the first two matches of the tournament, a 3–1 win against Japan and a narrow 1–0 loss to the reigning World Champion United States as Spain finished second in their debut SheBelieves appearance.
