|Full name||Sergio Almaguer Treviño|
|Date of birth||16 May 1969|
|Place of birth||Monterrey, Mexico|
|Height||1.83 m (6 ft 0 in)|
|Playing position||Centre Back|
|2002||→ Galatasaray (loan)||4||(0)|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Sergio Almaguer Treviño (born May 16, 1969) is a Mexican coach and former striker. Almaguer made his professional debut with former Mexican club Ángeles de Puebla on May 16, 1987. Almaguer played with nine different clubs in Mexico and Turkey and also capped for the Mexico national football team.
Almaguer started his career with former club Ángeles de Puebla, where he played 27 games and scored three goals. After one season with Angeles he transferred to Puebla, spending three seasons with the team. After the 1989–90 season Almaguer transferred to Querétaro FC, he appeared in 35 games and scored 11 goals. Between 1991 and 1996 Almaguer played with Tigres, he also played for Correcaminos UAT for the 1994–95 season. For the Invierno 1996 season turned to a defender after playing as a striker for the first nine years of his career. In his first season playing at defense, Almaguer played with Puebla, he played in 35 games and scored just two goals.
After playing with Puebla, Almaguer was transferred to Necaxa for the Invierno 1997 season. His tenure with Necaxa was successful, he was champion in the Invierno 1998 season and won the 1999 CONCACAF Champions' Cup. After four years playing with Necaxa he signed with Cruz Azul where he spent two years appearing in 37 games. He was loaned to Galatasaray of the Turkey Süper Lig for one year, he only appeared in four league matches, three UEFA Champions League matches and scored no goals. After half a season in Turkey he returned to Mexico, he signed with Chiapas. On June 28, 2005, Almaguer announced his retirement ending his 18 year career.
On February 20, 2008 Almaguer was named coach of his former team, Jaguares de Chiapas. Almaguer made his debut three days later against Tecos UAG, Jaguares won 2–0. He led the team to six victories, two draws and three losses to end the season. In the first round of the postseason, Jaguares defeated Cruz Azul 1–0 in the first leg. In the second leg Cruz Azul won 2–1 and won on aggregate 2–2 because Cruz Azul was a higher seed. After losing five of the first 10 games of the Apertura season Jaguares fired Almaguer.
On July 26, 2010, Almaguer coached his first Mexico's U-18 game against Ireland's U-18, resulting in a 1-1 draw.
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- "Almaguer, Sergio". National Football Teams. Retrieved 2008-11-04.
- "1990–91 season". mediotiempo.com. Retrieved 2008-11-04.
- "1994–95 season". mediotiempo.com. Retrieved 2008-11-04.
- "1999 CONCACAF Champions' Cup". concacaf.com. Retrieved 2008-11-04.
- "Invierno 1998 final". mediotiempo.com. Archived from the original on 2008-06-18. Retrieved 2008-11-04.
- "Se retira Almaguer" (in Spanish). ESPN Deportes. Retrieved 2008-11-04.
- "Le dan la responsabilidad". ESPN Deportes. Retrieved 2008-11-04.
- "Sergio Almaguer coaching record". mediotiempo.com. Retrieved 2008-11-04.[dead link]
- "Clausura 2008 season". mediotiempo.com. Archived from the original on 2008-06-18. Retrieved 2008-11-04.
- "First leg". mediotiempo.com. Retrieved 2008-11-04.
- "Second leg". mediotiempo.com. Retrieved 2008-11-04.
- "Se terminó la paciencia" (in Spanish). ESPN Deportes. Retrieved 2008-11-04.
- "Northern Ireland: Milk Cup".
- Sergio Almaguer Liga MX stats at Medio Tiempo.com (Spanish)