Born in Bellavista, Seville, Doblas spent four seasons with local Real Betis's B-team, where he was the undisputed starter before moving on loan to Andalusian neighbours Xerez CD.

[1] He remained a starter for the remainder of the campaign, taking part in the 2005 Copa del Rey final against CA Osasuna which Betis won 2–1;[2] in the competition's semi-final second leg against Athletic Bilbao he saved two penalties in a shootout[3] and, in August 2005, he signed his first professional contract at already 25.

[4] Doblas was also a key element in Betis' first-ever qualification to the UEFA Champions League, as he saved a Camel Meriem penalty against AS Monaco FC in the third qualify round, a 3–2 win.

[8] He was reinstated in the squad in late April, donning nº 25 after teammate Rafael Sobis switched to 21; in June 2008 he was released by Betis and, on 1 September, joined second level side Real Zaragoza, meeting the same fate at the end of the season.

[17] On 29 August of the following year, following a brief spell back in his country with lowly UE Cornellà, he signed for Indian Super League franchise Delhi Dynamos FC.