|Full name||Mario Alberto Rosas Montero|
|Date of birth||22 May 1980|
|Place of birth||Málaga, Spain|
|Height||1.67 m (5 ft 5 1⁄2 in)|
|Playing position||Attacking midfielder|
|2001–2002||→ Salamanca (loan)||33||(0)|
|* Senior club appearances and goals counted for the domestic league only|
Rosas was born in Málaga, Andalusia. Another product of FC Barcelona's prolific youth system, La Masia, he quickly excelled at its B-side, making his first-team debut on 15 May 1998 in a 1–4 home loss for the already crowned champions against UD Salamanca, in what would be his only La Liga appearance for the Catalans.
Released by Barça in 2000, Rosas joined another team in the top flight, Deportivo Alavés, but failed to appear regularly, being also loaned to second division's Salamanca in his second season. His career would be highly irregular in the following years, with outputs of less than five games – CD Numancia, Cádiz CF, both in the same level – and also playing with Girona FC in division three, with relegation.
Rosas then joined another club in the second tier, CD Castellón, in 2005–06. After a slow first year he became an undisputed starter, adding 16 league goals in the following three combined. On 7 September 2008, he scored twice – one from a penalty kick, one of his specialties– in a 2–0 home win against Celta de Vigo.
In early August 2010, after Murcia's relegation, 30-year-old Rosas joined former side Salamanca, penning a two-year contract. After meeting the same fate with the Castile and León club, he terminated his contract and moved abroad for the first time in his career, signing for FK Khazar Lankaran in Azerbaijan.
- "Adiós con sonrojo" [Embarrassing goodbye]. Mundo Deportivo (in Spanish). 16 May 1998. Retrieved 23 May 2015.
- "Pasé de ser el niño bonito del Barça a Segunda B" [I went from Barça poster boy to Segunda B]. El País (in Spanish). 17 February 2009. Retrieved 20 September 2012.
- "Castellón y Huesca empatan en un choque igualado" [Castellón and Huesca draw in even match]. Marca (in Spanish). 31 August 2008. Retrieved 11 July 2014.
- "Abel Resino le gana la partida a Pepe Murcia en Castalia" [Abel Resino wins match against Pepe Murcia in Castalia]. Marca (in Spanish). 7 September 2008. Retrieved 25 September 2008.
- "Mario Rosas y Pablo Redondo, primeros refuerzos del Hércules" [Mario Rosas and Pablo Redondo, first Hércules signings]. Marca (in Spanish). 6 December 2012. Retrieved 11 December 2012.