Tania Pérez started playing basket at good level in Draft Gramanet and already in the 2007/08 season she moved to Sarrià, where she won the Silver Medal in the U18 Spanish Championship and became also Catalan U18 Champion.

At senior level, Tania Pérez won the Copa Catalunya with Sarrià in the 2009/10 season and prometed to Spanish Liga Femenina 2, where, in the 2010/11 season she averaged 8 points, 3.6 rebounds and 1.7 steals in 26 minutes per game, having her best game against Conquero with 26 points and +32 efficiency.

In the 2011 summer, Tania Pérez won the Gold Medal in the U20 Europan Championship played in Novi Sad and she averaged 4.2 points and 2.1 rebounds in 16 minutes per game.

Tania Pérez had her first experience in Spanish Liga Femenina after signing with Sedis Cadí in the 2011/12 season. She could not have her debut in that season due to an injury but in the 2012/13 she averaged 3.9 points and +4.1 efficiency in 11 minutes per game, reaching the League Semifinals. Tania became Sedis Cadí´s captain in the 2013/14 season and she averaged 5.1 points and 2.5 rebounds per game. In the 2014/15 season, Tania Pérez reached again the Liga Femenina Semifinals with Sedis Cadí and she had great playoffs, averaging 9.7 points and 4 rebounds per game.

In May 2015, Tania Pérez signed in Argentina with Berazategui and averaged 8.6 points and 4.5 rebounds per game, becoming regular season champion and reaching the final in the playoffs.

Tania Pérez continued in Sedis Cadí in the 2015/16 and se averaged 8 points and 2.4 rebounds in 24 minutes per game with 57% from the field, finishing in 5th position in Spanish Liga Femenina. Tania had her best games against Gernika (15 points +19 efficiency) and against CREF (15 points).

In the 2016/17 season, Tania Pérez extended her contract with Sedis Cadí and she avereaged 8.3 points, 3.5 rebounds and +9.7 efficiency with 36% in threes, shining with 17 points, 8 rebounds and +25 efficiency against Perfumerías Avenida.

In the 2017/18 season, Tania Pérez signed in Poland with Sleza Wroclaw and she averaged 7.8 points, 3.3 rebounds, 2.2 assists and +8.7 efficiency in the Eurocup and 3.9 points, 2 rebounds and +4.7 efficiency in 21 minutes per game in Polish League, reaching the 3rd position.

Tania Pérez returned to Spain during the 2018/19 season and playing for Mann Filter Zaragoza she averaged 6.8 points, 3.2 rebounds, 2 assists and +10 efficiency per game.

In the 2019/20 season, Tania Pérez signed with Araski and she averaged 9.1 points, 2.8 rebounds and +10.7 efficiency in 25 minutes per game.

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