Question: What Jamaican boxer won against the author of "Rocky Ros Muc: Seán Ó Mainnín"?

Context paragraphs:
Seán Tubridy: Seán Tubridy (Irish: "Seán Ó Tiobraide" ; 1897 – 15 July 1939) was an Irish politician and medical practitioner.  Tubridy had two spells as a Fianna Fáil TD for Galway, from 1927–1932 and 1937–1939.  His parents had originally moved to Carraroe in Connemara to teach at the local Irish-language school.  Tubridy was also involved in Gaeltacht affairs and in the mid-1930s was a co-founder of "Muintir na Gaeltachta", along with Peadar Duignan and Máirtín Ó Cadhain.

CLG Na Piarsaigh: CLG Na Piarsaigh is a Gaelic Athletic Association club in County Galway.  The club takes its name from the Irish revolutionaries Pádraic and Willie Pearse.  Pádraic has a cottage in the area which over looks the club grounds.  The club's crest includes the cottage and a swallow.  The Swallow is taken for the short story he wrote set in ros Muc called Eoghainín na nÉan.

Mike McCallum: Mike McCallum (born 7 December 1956) is a Jamaican former professional boxer who competed from 1981 to 1997.  He is a three-weight world champion, having held the WBA super welterweight title from 1984 to 1988; the WBA middleweight title from 1989 to 1991; and the WBC light heavyweight title from 1994 to 1995.

Innti: Innti was an Irish language poetry movement, associated with a journal of the same name founded in 1970 by Michael Davitt, Nuala Ní Dhomhnaill, Gabriel Rosenstock, Louis de Paor and Liam Ó Muirthile.  These writers were students of University College Cork, drawing inspiration from Seán Ó Ríordáin and Seán Ó Riada, as well as American influences such as the Beat movement and counterculture.  Their reception was mixed, with Gaelic-traditionalists resenting their urbanism, social liberalism and Anglo-American influences.

Sean Mannion (boxer): Sean Mannion (born October 6, 1956 in Rosmuc, Ireland) is a former boxer in the light middleweight division.  He boxed out of Massachusetts in the United States.  His most notable bout was against Mike McCallum for the vacant WBA title, which he lost over a fifteen round unanimous decision.  Newline Films reportedly plans to make a film about his life story.  In January 2014, "Rocky Ros Muc: Seán Ó Mainnín", a biography about Mannion's life and career was released.  The book is written in Irish but there are plans afoot to release an English version.

Cumann Peile Na bPiarsaigh (Gaillimhe): Cumann Peile Na bPiarsaigh is a Gaelic Athletic Association club based in the Ros Muc, Camus and Recess areas in Conamara, County Galway, Ireland.  The club is a member of the Galway GAA.  Cumann Peile Na bPiarsaigh GAA Club caters for large numbers of young boys and girls and adults who play Football and Ladies Football in the parishes of Ros Muc, Camus and Recess.

Seán Ó hEinirí: Seán Ó hEinirí (Seán Ó hInnéirghe, 1915 – 26 July 1998), known in English as John Henry, was an Irish seanchaí and a native of Cill Ghallagáin, County Mayo.  He is believed to have been the last known monolingual Irish speaker.

Darach Ó Catháin: Darach Ó Catháin (30 September 1922 – 29 September 1987) was an Irish sean-nós singer, that is, of traditional Irish language folksong.  Along with his fellow Connemara-native, Seosamh Ó hÉanaí (Joe Heaney), he was one of the most prominent sean-nós singers of his day and was praised by Seán Ó Riada.  Ó Catháin left Ireland for work and set down in Leeds, West Yorkshire where he lived out the rest of his life.

United Irishman (1948 newspaper): The United Irishman/An tÉireannach Aontaithe, first published in May 1948, under Michael Traynor, was the official monthly organ of Sinn Féin sold by its members.  After the split in the Irish Republican Movement, the title continued as the organ of Official Sinn Féin, being published from the offices in 30 Gardner Place in Dublin, with the Provisional wing publishing An Phoblacht.  The first editor was Seán G. O'Kelly based in an office in 38 South King Street in Dublin.  The historian Éamonn MacThomáis edited the paper for a short while prior to the 1970 split in Sinn Féin.  Other editors of the paper included Seán Cronin, Seán Ó Brádaigh (1958–1960), Ruairí Ó Brádaigh, Eoin Ó Murchú, Jackie Ward, Seamus Ó Tuathail, Denis Foley and Tony Meade (1967).  Contributors to the paper included Eamon McCann, Roy Johnston, Eamon Smullen, Eoghan Harris and Sean Garland.  The "United Irishman" was replaced with "The Irish People" and the "Workers' Weekly" in 1980.

Rosmuc: Rosmuc or Ros Muc (formerly anglicised as Rosmuck) is a village in the heart of the Conamara Gaeltacht of County Galway, Ireland.  It lies halfway between the town of Clifden and the city of Galway.  Irish is the predominant spoken language.  The District Electoral Division of Turlough, Rosmuc, state that Rosmuc is the most strongly Irish-speaking area in the country.

Supporting paragraphs: Sean Mannion (boxer) Mike McCallum
Answer: Mike McCallum