Question:  Guerra de Titanes was a  pay-per-view (PPV) event staring A.J. Styles that was about what sport?
Context: "Guerra de Titanes" (2010) ("War of the Titans") was professional wrestling major show event produced by AAA, which took place on December 5, 2010, in the "Auditorio Benito Juárez" in Zapopan, Jalisco, Mexico.  The event was the fourteenth "Guerra de Titanes" show promoted by AAA since 1997 and was headlined by a match for the AAA Mega Championship between champion Dr. Wagner Jr. and challenger El Zorro.  The main event of the evening saw "Los Perros del Mal" handing "Los Psycho Circus" their first ever loss, ending their three-year-long undefeated streak. "Guerra de Titanes" (2008) ("War of the Titans") was the twelfth annual "Guerra de Titanes" professional wrestling show promoted by AAA.  The show took place on December 6, 2008 in Orizaba, Mexico, the same venue used for the 2006 and 2007 events.  The Main event featured a Ladder match for the vacant AAA Mega Championship between El Mesias and El Zorro and saw Mesias win the match to become a two time champion.  In addition to the main event the show featured a Steel Cage Match "Lucha de Apuestas" where the last man left in the cage would have his hair shaved off.  The participants in the cage match were brothers El Brazo and Brazo de Plata as well as Pirata Morgan, Electroshock, Super Fly and El Elegido and saw El Brazo shaved bald as a result of his loss.  As is tradition with AAA major events the wrestlers compete inside a hexagonal wrestling ring and not the four sided ring the promotion uses for television events and House shows. "Guerra de Titanes" (2009) ("War of the Titans") was the thirteenth annual "Guerra de Titanes" professional wrestling show promoted by AAA since 1997.  The show took place on December 11, 2009 in the Ciudad Madero, Tamaulipas Convention center, a site that AAA has used for many of their major shows.  "Guerra de Titanes" is AAA's "End of year" show and the fifth of their "big shows" they hold every year.  The Main Event saw Dr. Wagner Jr. defend the AAA Mega Championship against El Mesias in a "Domo De La Muerte" cage match.  The show also featured two AAA championship matches as Nicho el Millonario and Joe Líder defended the AAA World Tag Team Championship and Mini Charly Manson defended the AAA World Mini-Estrella Championship.  Furthermore a "Mask vs. Hair", Lucha de Apuesta match between Faby Apache and Sexy Star took place as well.  Finally the show featured a Six-man "Lucha Libre rules" tag team match and a four on four "AAA vs. "La Legion Extranjera" elimination match where the winner would receive a title match for the AAA Mega Championship as AAA's 2010 "Rey de Reyes" show. Allen Neal Jones (born June 2, 1977), best known by the ring name AJ Styles (also stylized as A.J. Styles), is an American professional wrestler who is signed to WWE performing on the SmackDown brand, where he is the current United States Champion in his second reign.  He has long been regarded as one of the world's best professional wrestlers. Guerra de Titanes (Spanish for "War of the Titans") was a professional wrestling event produced by the Lucha Libre AAA World Wide (AAA) promotion, which took place on December 7, 2014, in Zapopan, Jalisco, Mexico .  The event was the eighteenth "Guerra de Titanes" end of the year show promoted by AAA since 1997.  The announced main event was the AAA Mega Champion El Texano Jr. defending the championship against El Patrón Alberto. Guerra de Titanes (Spanish for "War of the Titans") is a major professional wrestling event produced by Lucha Libre AAA World Wide (AAA), a Mexican promotion.  The event was originally announced for December 5, 2015, but was postponed to January 22, 2016, without an official explanation for the delay.  The event is the nineteenth "Guerra de Titanes" show, traditionally AAA's "end of the year" that started in 1997, breaking with tradition in 2016. "Guerra de Titanes" (2001) ("War of the Titans") was the fifth "Guerra de Titanes" professional wrestling show promoted by AAA.  The show took place on November 23, 2001 in Mexico City, Mexico.  The Main event featured a "Four Way" Elimination "Lucha de Apuestas" which meant that the loser would have his hair shaved off.  The participants were Heavy Metal lost to Perro Aguayo Jr., Héctor Garza and Latin Lover, who had all competed in the main event of "Guerra de Titanes" 2000 as well. Guerra de Titanes (Spanish for "War of the Titans") was a professional wrestling event produced by the AAA promotion, which took place on December 8, 2013, at "Auditorio de la Gente" in Tepic, Nayarit.  The event was the seventeenth "Guerra de Titanes" end of the year show promoted by AAA since 1997.  The state government of Nayarit bought all tickets to the event and allowed people to attend it for free on a "first-come, first-served" basis. Guerra de Titanes (Spanish for "War of the Titans") was a major professional wrestling event scripted and produced by Lucha Libre AAA World Wide (AAA), a Mexican promotion.  The event was the twentieth annual "Guerra de Titanes" show which, until 2015, has traditionally been AAA's "end of the year" show.  In 2016 the show was shifted from December to January instead.  The show was held in "Gimnasio Juan de la Barrera" in Mexico City, Mexico which also hosted the 2016 "Guerra de Titanes" show. Guerra de Titanes (Spanish for "War of the Titans") was a professional wrestling pay-per-view (PPV) event produced by the AAA promotion, which took place on December 16, 2011, at "Estadio Hermanos Serdán" in Puebla, Puebla, Mexico.  The event was the fifteenth "Guerra de Titanes" end of the year show promoted by AAA since 1997.  The event included appearances by Total Nonstop Action Wrestling (TNA) wrestlers A.J. Styles, D'Angelo Dinero, Gunner and Rob Terry as part of the ongoing storyline invasion of wrestlers from the American promotion.  The pay-per-view was headlined by a match for the AAA Latin American Championship, between champion Dr. Wagner Jr. and challenger L.A. Park.  The conclusion of the match led to the AAA debuts of Máscara Año 2000 Jr., El Texano Jr. and Toscano, starting a new storyline, where the three posed as invaders from rival promotion Consejo Mundial de Lucha Libre (CMLL).
Answer: wrestling