[1] Born in Barcelona, he began his career at FC Central in 1909, but the club was dissolved in 1910 and its field was acquired by FC Numancia, and most of the Central players, including Bau, joined Numancia.

[2] Bau quickly become a key element of the team, and even though the team's main source of power was its infamous backline made of Hermenegild Casellas and Eduardo Reguera, he also played a very important role in the team's rise to national dominance, competing head-to-head against the likes of Barcelona and Espanyol, helping FC Espanya win its first-ever piece of silverware, the 1912–13 Catalan championship, which was followed by another championship in 1913–14,[2] so he was signed by FC Barcelona in early 1914, with whom he won the 1915–16 Catalan championship,[3][4] as the team's top scorer even ahead of the great Paulino Alcántara.

[2] In the quarter-finals of the 1914 Pyrenees Cup, Bau netted a brace in a 5–0 victory over CS Sabadell, thus reaching the semi-finals where Barça faced his former club FC Espanya, and Bau scored again, but his new side still lost 2–5, courtesy of a poker from Jaime Bellavista, thus ousting him for the top scorer of the tournament.

[2] Like many other FC Espanya players of that time, Bau was eligible to play for the Catalonia national team, and in 1912, the Catalan Federation called him to be part of the team's first-ever game recognized by FIFA on 20 February 1912, which ended in a 0–7 loss to France.

[6] He died in Barcelona and was buried in the Cemetery of the Corts, near his club's stadium.