The 2018 Copa Libertadores group stage was played from 27 February to 24 May 2018. ^[1] A total of 32 teams competed in the group stage to decide the 16 places in the final stages of the 2018 Copa Libertadores. ^[2]

The draw for the group stage was held on 20 December 2017, 20:00 PYST ( UTC−3), at the CONMEBOL Convention Centre in Luque, Paraguay. ^{[3] [4]}

Teams were seeded by their CONMEBOL ranking of the Copa Libertadores (shown in parentheses), taking into account of the following three factors: ^[5]

1. Performance in the last 10 years, taking into account Copa Libertadores results in the period 2008–2017
2. Historical coefficient, taking into account Copa Libertadores results in the period 1960–2007
3. Local tournament champion, with bonus points awarded to domestic league champions of the last 10 years

For the group stage, the 32 teams were drawn into eight groups (Groups A–H, also denoted as Groups 1–8) of four containing a team from each of the four pots. Teams from the same association could not be drawn into the same group, excluding the winners of the third stage, which were allocated to Pot 4 and whose identity was not known at the time of the draw, and could be drawn into the same group with another team from the same association. ^[6]

Group stage draw

Pot 1	Pot 2	Pot 3	Pot 4
Grêmio [†] (3) River Plate (1) Boca Juniors (2) Atlético Nacional (4) Peñarol (6) Santos (11) Corinthians (12) Cruzeiro (13)	Independiente [‡] (31) Emelec (14) Estudiantes (17) Cerro Porteño (18) Palmeiras (22) Bolívar (23) Libertad (24) Universidad de Chile (25)	The Strongest (26) Colo-Colo (27) Racing (33) Flamengo (35) Defensor Sporting (36) Alianza Lima (58) Millonarios (65) Real Garcilaso (68)	Atlético Tucumán (88) Deportivo Lara (105) Delfín (206) Monagas (207) Third stage winner G1 Third stage winner G2 Third stage winner G3 Third stage winner G4

Notes

The following were the four winners of the third stage of qualifying which joined the 28 direct entrants in the group stage.

Match	Third stage winners
G1	Santa Fe (21)
G2	Nacional (5)
G3	Vasco da Gama (54)
G4	Junior (60)

In the group stage, each group was played on a home-and-away round-robin basis. The teams were ranked according to points (3 points for a win, 1 point for a draw, and 0 points for a loss). If tied on points, the following criteria were used to determine the ranking: 1. Goal difference; 2. Goals scored; 3. Away goals scored; 4. CONMEBOL ranking (Regulations Article 28). ^[2]

The winners and runners-up of each group advanced to the round of 16 of the knockout stages. The third-placed teams of each group entered the Copa Sudamericana second stage.

The fixture list was determined by the draw as follows: ^[6]

• Round 1: Team 3 vs. Team 1, Team 4 vs. Team 2
• Round 2: Team 1 vs. Team 4, Team 2 vs. Team 3
• Round 3: Team 2 vs. Team 1, Team 3 vs. Team 4
• Round 4: Team 1 vs. Team 2, Team 4 vs. Team 3
• Round 5: Team 4 vs. Team 1, Team 3 vs. Team 2
• Round 6: Team 1 vs. Team 3, Team 2 vs. Team 4

The matches were played on 27–28 February, 1, 13–15 March, 3–5, 11, 17–19, 24–26 April, 1–3, 15–17 and 22–24 May 2018. ^{[7] [8] [9]}

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		GRE	CPO	DEF	MON
1	Grêmio	6	4	2	0	13	2	+11	14	Round of 16		—	5–0	1–0	4–0
2	Cerro Porteño	6	4	1	1	8	8	0	13			0–0	—	2–1	3–2
3	Defensor Sporting	6	1	1	4	5	7	−2	4	Copa Sudamericana		1–1	0–1	—	3–1
4	Monagas	6	1	0	5	5	14	−9	3			1–2	0–2	1–0	—

---

---

---

---

---

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		ATN	CCL	BOL	DEL
1	Atlético Nacional	6	3	1	2	9	3	+6	10	Round of 16		—	0–0	4–1	4–0
2	Colo-Colo	6	2	2	2	5	5	0	8			0–1	—	2–0	0–2
3	Bolívar	6	2	2	2	6	9	−3	8	Copa Sudamericana		1–0	1–1	—	2–1
4	Delfín	6	2	1	3	6	9	−3	7			1–0	1–2	1–1	—

---

---

---

---

---

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		LIB	ATU	PEÑ	STR
1	Libertad	6	4	1	1	10	4	+6	13	Round of 16		—	0–0	2–1	3–0
2	Atlético Tucumán	6	3	1	2	7	6	+1	10			0–2	—	1–0	3–0
3	Peñarol	6	3	0	3	8	5	+3	9	Copa Sudamericana		2–0	3–1	—	2–0
4	The Strongest	6	1	0	5	3	13	−10	3			1–3	1–2	1–0	—

---

---

---

---

---

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		RIV	FLA	SFE	EME
1	River Plate	6	3	3	0	6	3	+3	12	Round of 16		—	0–0	0–0	2–1
2	Flamengo	6	2	4	0	7	4	+3	10			2–2	—	1–1	2–0
3	Santa Fe	6	1	4	1	5	3	+2	7	Copa Sudamericana		0–1	0–0	—	1–1
4	Emelec	6	0	1	5	3	11	−8	1			0–1	1–2	0–3	—

---

---

---

---

---

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		CRU	RAC	VAS	UCH
1	Cruzeiro	6	3	2	1	15	5	+10	11	Round of 16		—	2–1	0–0	7–0
2	Racing	6	3	2	1	12	6	+6	11			4–2	—	4–0	1–0
3	Vasco da Gama	6	1	2	3	3	10	−7	5	Copa Sudamericana		0–4	1–1	—	0–1
4	Universidad de Chile	6	1	2	3	2	11	−9	5			0–0	1–1	0–2	—

---

---

---

---

---

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		SAN	EST	NAC	RGA
1	Santos	6	3	1	2	6	4	+2	10	Round of 16		—	2–0	3–1	0–0
2	Estudiantes	6	2	2	2	6	4	+2	8			0–1	—	3–1	3–0
3	Nacional	6	2	2	2	7	6	+1	8	Copa Sudamericana		1–0	0–0	—	4–0
4	Real Garcilaso	6	1	3	2	2	7	−5	6			2–0	0–0	0–0	—

---

---

---

---

---

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		COR	IND	MIL	LAR
1	Corinthians	6	3	1	2	11	5	+6	10	Round of 16		—	1–2	0–1	2–0
2	Independiente	6	3	1	2	6	4	+2	10			0–1	—	1–0	2–0
3	Millonarios	6	2	2	2	7	4	+3	8	Copa Sudamericana		0–0	1–1	—	4–0
4	Deportivo Lara	6	2	0	4	5	16	−11	6			2–7	1–0	2–1	—

---

---

---

---

---

Pos	Team v t e	Pld	W	D	L	GF	GA	GD	Pts	Qualification		PAL	BOC	JUN	ALI
1	Palmeiras	6	5	1	0	14	3	+11	16	Round of 16		—	1–1	3–1	2–0
2	Boca Juniors	6	2	3	1	8	4	+4	9			0–2	—	1–0	5–0
3	Junior	6	2	1	3	5	8	−3	7	Copa Sudamericana		0–3	1–1	—	1–0
4	Alianza Lima	6	0	1	5	1	13	−12	1			1–3	0–0	0–2	—

---

---

---

---

---

• CONMEBOL Libertadores 2018, CONMEBOL.com