Mexico was represented at the OTI Festival 1985 with the song "", written by , and performed by Eugenia León. The Mexican participating broadcaster, Televisa, selected its entry through a national televised competition with several phases. The song, that was performed in position 8, placed first out of 21 competing entries, winning the festival. This was the third entry from Mexico that won the OTI Festival, after winning in 1973 and in 1975.
Televisa held a national competition with four televised qualifying rounds, a playoff, two semi-finals, and a final to select its entry for the 14th edition of the OTI Festival. This fourteenth edition of the National OTI Festival featured twenty-eight songs in the qualifying rounds, twelve in the semi-finals, and six in the final. In addition to the general competition, awards were given for Best Male Performer, Best Female Performer, Best Musical Arrangement, Breakout Male Artist, and Breakout Female Artist among all the competing artists.
The qualifying rounds were held at Studio 2 of Televisa San ÃÂngel, while the semi-finals and the final were held at the National Auditorium in Mexico City, all presented by Raúl Velasco, and broadcast on . The musical director was , who conducted the orchestra when required.
The four qualifying rounds were held on Saturdays 3, 10, 17, and 24 August 1985. Each round featured seven entries, of which the two highest-scoring advanced to the semi-finals. In each round, after all the competing entries were performed, each of the eleven jurors cast one vote for each of their two favorite entries.
The playoff was held on Saturday 24 August 1985 following the fourth qualifying round. To select the last four semi-finalists, each of the eleven jurors cast one vote for each of their four favorite entries among the twenty not qualified.
The semi-finals were held on Friday 30 and Saturday 31 August 1985. The twelve songs that had been qualified were distributed between the two semi-finals. In each semi-final, after all the competing entries were performed, each of the fifteen jurors cast one vote for each of their three favorite entries, and the three most voted songs from each semi-final went on to the final.
The six-song final was held on Sunday 1 September 1985. The final was held in two rounds. In the first round, each of the fifteen jurors cast one vote for each of their three favorite entries, and the three most voted songs went on to the superfinal. In the superfinal, each juror announced aloud one vote for their favourite entry.
The winner was "", written by , and performed by Eugenia León. The festival ended with a reprise of the winning entry.
In the final, the jurors voted for the Best Male and Female Performer, Best Musical Arrangement, and Breakout Male and Female Artist among the three shortlisted artist in each category.
José Alberto Fuentes received the Best Male Performer Award; the Best Female Performer Award; the Best Musical Arrangement Award for ""; Ricky Luis the Breakout Male Artist Award; and Eugenia León the Breakout Female Artist Award.
Las 12 finalistas del Festival OTI 85 is the official compilation album of the fourteenth edition of the Mexican National OTI Festival, released by Melody in 1985. The vinyl LP features the studio version of the twelve songs qualified for the semi-finals.
On 21 September 1985, the OTI Festival was held at Teatro Lope de Vega in Seville, Spain, hosted by , and broadcast live throughout Ibero-America. Eugenia León performed "" in position 8, with Chucho Ferrer conducting the event's orchestra, and placing first of 21 competing entries, winning the festival. This was the third entry from Mexico that won the OTI Festival, after winning in 1973 and in 1975.