Monaco started its Champions League campaign with yet another home defeat, losing 2-1 to Atletico Madrid on Tuesday.

After losing all three home games in the group stage last season, Leonardo Jardim's side grabbed an early lead against the run of the play with a goal from Champions League debutant Samuel Grandsir.

More Images
Atletico midfielder Rodrigo Hernandez, center, and Monaco midfielder Youri Tielemans jumps for the ball as Monaco midfielder Jean-Eudes Aholou looks on during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Monaco started its Champions League campaign with yet another home defeat, losing 2-1 to Atletico Madrid on Tuesday.

Atletico forward Diego Costa celebrates his goal during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

The visitors had the stronger start and dominated with a high press that suffocated Monaco in the early stages. Costa came close of opening the scoring after only six minutes following a combination with Antoine Griezmann, but his curled shot ended just wide of Diego Benaglio's post.

Atletico forward Diego Costa scores a goal past to Monaco goalkeeper Diego Benaglio during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico dominated the remainder of the first half and took the lead from a corner just before the interval as Gimenez jumped higher than Falcao and Kevin N'Doram score with a powerful header.

Atletico forward Antoine Griezmann, right, and Atletico midfielder Koke celebrate a goal during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico forward Antoine Griezmann, right, and Atletico midfielder Koke celebrate a goal during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Monaco defender Jesus Nascimento Jemerson, right, challenges with Atletico defender Juanfran during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Monaco defender Jesus Nascimento Jemerson, right, challenges with Atletico defender Juanfran during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico midfielder Saul Niguez, right, battles with Monaco midfielder Nacer Chadli during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico midfielder Saul Niguez, right, battles with Monaco midfielder Nacer Chadli during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

However, Atletico dominated for long spells and struck back before the interval through goals from Diego Costa and Jose Gimenez.

Atletico midfielder Rodrigo Hernandez, center, and Monaco midfielder Youri Tielemans jumps for the ball as Monaco midfielder Jean-Eudes Aholou looks on during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico midfielder Rodrigo Hernandez, center, and Monaco midfielder Youri Tielemans jumps for the ball as Monaco midfielder Jean-Eudes Aholou looks on during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

The visitors had the stronger start and dominated with a high press that suffocated Monaco in the early stages. Costa came close of opening the scoring after only six minutes following a combination with Antoine Griezmann, but his curled shot ended just wide of Diego Benaglio's post.

Grandsir's pace and runs caused some trouble, though, and he took advantage of a lapse of concentration in Atletico's back four to break the deadlock. Djibril Sidibe launched the move down the right flank and crossed for Radamel Falcao, who ran into the box and found Grandsir with a cutback pass that created panic in the area. Angel Correa and Saul Niguez could not clear the ball and the 22-year-old winger slotted home from close range with his right foot.

Atletico pushed hard for an equalizer and was rewarded after a string of one-touch passes culminated in Costa's goal in the 32nd minute. Griezmann provided the assist with a subtle pass near the edge of the box that Costa collected before beating Benaglio.

Atletico forward Diego Costa celebrates his goal during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico forward Diego Costa celebrates his goal during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico dominated the remainder of the first half and took the lead from a corner just before the interval as Gimenez jumped higher than Falcao and Kevin N'Doram score with a powerful header.

More AP soccer: https://apnews.com/tag/apf-Soccer and https://twitter.com/AP_Sports

Atletico forward Diego Costa scores a goal past to Monaco goalkeeper Diego Benaglio during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico forward Diego Costa scores a goal past to Monaco goalkeeper Diego Benaglio during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico forward Antoine Griezmann, right, and Atletico midfielder Koke celebrate a goal during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico forward Antoine Griezmann, right, and Atletico midfielder Koke celebrate a goal during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Monaco defender Jesus Nascimento Jemerson, right, challenges with Atletico defender Juanfran during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Monaco defender Jesus Nascimento Jemerson, right, challenges with Atletico defender Juanfran during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico midfielder Saul Niguez, right, battles with Monaco midfielder Nacer Chadli during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)

Atletico midfielder Saul Niguez, right, battles with Monaco midfielder Nacer Chadli during the Champions League Group A soccer match between Monaco and Atletico Madrid at the Louis II stadium in Monaco, Tuesday, Sept. 18, 2018. (AP PhotoClaude Paris)