Editing Colo-Colo (section)

===1933–1973: Beginnings in professional football===
In 1933, Colo-Colo alongside six clubs from [[Santiago de Chile|Santiago]] decided to create the [[Chilean Primera División|Chilean professional football league]].<ref name="Salinas, Sebastián 2005">Salinas, Sebastián (2005), p. 327.</ref> On 23 July, the team won the [[Campeonato de Apertura (Chile)|Campeonato de Apertura]] ([[Copa Chile]] precursor), after defeating 2–1 to [[Unión Española]].<ref name="Salinas, Sebastián 2005"/> However, in the first [[Chilean Primera División|Primera División]] official tournament, Colo-Colo finished first alongside [[C.D. Magallanes|Magallanes]], which forced the "Cacique" to play a tie-breaker match. That match was lost 2–1 by Colo-Colo.<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile33.html |title = Chile 1933 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 5 February 2023 |archive-url = https://web.archive.org/web/20230205035417/https://rsssf.org/tablesc/chile33.html |url-status = live }}</ref> In 1937 the team was undefeated,<ref>Marín, Edgardo (1988), p. 33.</ref> and reached its first league title.<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile37.html |title = Chile 1937 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 3 February 2023 |archive-url = https://web.archive.org/web/20230203093916/https://rsssf.org/tablesc/chile37.html |url-status = live }}</ref> Two seasons later, in 1939, Colo-Colo won the league title for a second time, now under the guidance of the Hungarian coach [[Francisco Platko]],<ref>Marín, Edgardo (1988), p. 43.</ref> and with [[Alfonso Domínguez]] as goalscorer with 20 goals in 24 matches.<ref>Marín, Edgardo (1988), p. 42.</ref> After another title in 1941 with Platko as coach,<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile41.html |title = Chile 1941 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 3 February 2023 |archive-url = https://web.archive.org/web/20230203104724/https://rsssf.org/tablesc/chile41.html |url-status = live }}</ref> the club went on to win the titles of 1944<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile44.html |title = Chile 1944 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 3 February 2023 |archive-url = https://web.archive.org/web/20230203094857/https://rsssf.org/tablesc/chile44.html |url-status = live }}</ref> and 1947.<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile47.html |title = Chile 1947 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 4 February 2023 |archive-url = https://web.archive.org/web/20230204061113/https://rsssf.org/tablesc/chile47.html |url-status = live }}</ref> The following year Colo-Colo organized the [[South American Club Championship (football)|South American Club Championship]] – [[Copa Libertadores]] background – in Santiago,<ref>{{cite web |first = Esteban |last = Bekerman |year = 2008 |url = http://www.perfil.com/contenidos/2008/03/13/noticia_0054.html |title = Hace 60 años, River perdía la gran chance de ser el primer club campeón de América |work = Perfil.com |access-date = 10 May 2008 |archive-url = https://web.archive.org/web/20130521034425/http://www.perfil.com/contenidos/2008/03/13/noticia_0054.html |archive-date = 21 May 2013 |url-status = dead }}</ref> which brought together the 1947 continent's champions. In 1945, the club had the worst season in its history, finishing penultimate in eleventh place only ahead of weak [[Badminton F.C.|Badminton]].<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile45.html |title = Chile 1945 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 4 February 2023 |archive-url = https://web.archive.org/web/20230204061215/https://rsssf.org/tablesc/chile45.html |url-status = live }}</ref>

In the early 1950s, club's president Antonio Labán hired [[Newcastle United F.C.|Newcastle United]] striker [[George Robledo]], paying [[£]]25,000 for its signing.<ref>Marín, Edgardo y Salviat, Julio (1975), p. 105.</ref> Robledo's performances led the team to the titles of 1953<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile53.html |title = Chile 1953 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 5 February 2023 |archive-url = https://web.archive.org/web/20230205040559/https://rsssf.org/tablesc/chile53.html |url-status = live }}</ref> and 1956.<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile56.html |title = Chile 1956 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 5 February 2023 |archive-url = https://web.archive.org/web/20230205045913/https://rsssf.org/tablesc/chile56.html |url-status = live }}</ref> During that age, the club acquired a terrain at [[Macul]], where began the construction of [[Estadio Monumental David Arellano|Estadio Monumental]].<ref name="Marín 1975">Marín, Edgardo y Salviat, Julio (1975), p. 119.</ref> Besides the acquisition, the directive invested in a headquarters located at [[Santiago Centro]] (located at Cienfuegos 41) in 1953. The next decade Colo-Colo win the titles of 1960<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile60.html |title = Chile 1960 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 4 February 2023 |archive-url = https://web.archive.org/web/20230204052720/https://rsssf.org/tablesc/chile60.html |url-status = live }}</ref> and 1963.<ref>{{cite web |first = Eduardo |last = Espina |year = 2005 |url = https://www.rsssf.org/tablesc/chile63.html |title = Chile 1963 |work = Rec.Sport.Soccer Statistics Foundation ([[RSSSF]]) |access-date = |archive-date = 4 February 2023 |archive-url = https://web.archive.org/web/20230204062111/https://rsssf.org/tablesc/chile63.html |url-status = live }}</ref> The 1963 team broke two top-tier records: [[Luis Hernán Álvarez]] scored 37 goals in a single season<ref name="Goleador">Marín, Edgardo y Salviat, Julio (1975), p. 130.</ref> (the highest number of goals scored by a Colo-Colo footballer during a season)<ref name="Goleador"/> and the netting of the highest number of goals scored by a club in a season (130).<ref>Marín, Edgardo y Salviat, Julio (1975), p. 131.</ref> The team won its tenth honour in 1970.<ref>Marín, Edgardo y Salviat, Julio (1975), p. 160.</ref>