Leagues Cup explained: How MLS vs. Liga MX competition works as Lionel Messi, Inter Miami face Liga MX's Atlas

Leagues Cup, the interleague competition between Major League Soccer and Liga MX, kicks off on Tuesday as the Columbus Crew will look to defend their title with new designated player Wessam Abou Ali now with the club after an impressive Club World Cup with Al Ahly. The forward will play a large role in their success but he won't be the only major signing to debut with Rodrigo De Paul joining Inter Miami to bolster their midfield.

The tournament will run from July 29-Aug. 31 with league play in MLS pausing for Phase One and resuming on Aug. 9. Here's everything that you need to know about the tournament:

Leagues Cup format

• Who plays who in the group stage? Phase One of the tournament will only see clubs from MLS face Liga MX sides.
• Who advances to the knockouts? Matches will take place between clubs from both leagues, and standings will be separated with each league in their own table, with the top four advancing to the quarterfinals, which will take place on Aug. 19-20. Because of this, goal difference and winning in regulation will be important because teams can finish the group stage winning all their matches but still miss out on the knockouts due to goal difference.
• Can there be ties? Games cannot end in ties, and if one is level at the end of regulation, a penalty shootout will decide the winner. Three points are earned for a win in regulation, one point for a regulation draw, and two points for the winner of the penalty shootout.

Why are San Diego FC in the tournament?

Not every MLS team will participate anymore, with teams now needing to qualify via the league table, where only the top nine teams from each conference make it. Due to the Vancouver Whitecaps competing in Concacaf Champions Cup and Canadian Championship, their spot in the competition will be taken by expansion side San Diego FC, who will look to build on their fast start to life in MLS, where they're at the top of the west.

Leagues Cup standings

Group A

Standing	Club	MP	W	D	L	GD	Pts
1	Atlanta United	0	0	0	0	0	0
2	Charlotte FC	0	0	0	0	0	0
3	FC CIncinatti	0	0	0	0	0	0
4	Colorado Rapids	0	0	0	0	0	0
5	Columbus Crew	0	0	0	0	0	0
6	Houston Dynamo	0	0	0	0	0	0
7	Inter Miami	0	0	0	0	0	0
8	LA Galaxy	0	0	0	0	0	0
9	Los Angeles FC	0	0	0	0	0	0
10	Minnesota United	0	0	0	0	0	0
11	CF Montreal	0	0	0	0	0	0
12	New York City FC	0	0	0	0	0	0
13	New York Red Bulls	0	0	0	0	0	0
14	Orlando City FC	0	0	0	0	0	0
15	Portland Timbers	0	0	0	0	0	0
16	Real Salt Lake	0	0	0	0	0	0
17	San Diego FC	0	0	0	0	0	0
18	Seattle Sounders	0	0	0	0	0	0

Group B

Standing	Club	MP	W	D	L	GD	Pts
1	Atlas	0	0	0	0	0	0
2	Atletico de San Luis	0	0	0	0	0	0
3	Club America	0	0	0	0	0	0
4	Cruz Azul	0	0	0	0	0	0
5	Chivas Guadalajara	0	0	0	0	0	0
6	Juarez	0	0	0	0	0	0
7	Club Leon	0	0	0	0	0	0
8	Mazatlan	0	0	0	0	0	0
9	Monterrey	0	0	0	0	0	0
10	Necaxa	0	0	0	0	0	0
11	Pachuca	0	0	0	0	0	0
12	Puebla	0	0	0	0	0	0
13	Pumas UNAM	0	0	0	0	0	0
14	Queretaro	0	0	0	0	0	0
15	Santos Laguna	0	0	0	0	0	0
16	Tigres UNAL	0	0	0	0	0	0
17	Club Tijuana	0	0	0	0	0	0
18	Toluca	0	0	0	0	0	0

Leagues Cup schedule and results

All times Eastern. All matches available on MLS Season Pass.

Tuesday, July 29

• Toluca vs. Columbus Crew, 7 p.m.
• CF Montreal vs. Club Leon, 7 p.m.
• NYCFC vs. Puebla, 8 p.m.
• Tigres vs. Houston Dynamo, 9 p.m.
• LAFC vs. Mazatlan, 10:30 p.m.
• Pachuca vs. San Diego FC, 11 p.m.

Wednesday, July 30

• Inter Miami vs. Atlas, 7:30 p.m.
• Necaxa vs. Atlanta United, 7:30 p.m.
• Pumas vs. Orlando City, 8 p.m.
• Minnesota United vs. Queretaro, 8:30 p.m.
• Club America vs. Real Salt Lake, 9:30 p.m.
• Portland vs. San Luis, 10:30 p.m.

Thursday, July 31

• Monterrey vs. Cincinnati, 7 p.m.
• Chivas Guadalajara vs. RBNY, 7:30 p.m.
• Charlotte vs. Juarez, 7:30 p.m.
• Colorado Rapids vs. Santos Laguna, 9:30 p.m.
• Cruz Azul vs. Seattle Sounders 10:30 p.m.
• LA Galaxy vs. Club Tijuana, 11 p.m.

Friday, Aug. 1

• NYCFC vs. Club Leon, 6 p.m.
• Columbus Crew vs. Puebla, 7 p.m.
• Houston Dynamo vs. Mazatlan, 8:30 p.m.
• Toluca vs. Montreal, 9 p.m.
• LAFC vs. Pachuca, 10:30 p.m.
• Tigres vs. San Diego, 11 p.m.

Saturday, Aug. 2

• Orlando City vs. Atlas, 6 p.m.
• Inter Miami vs. Necaxa, 7 p.m.
• Pumas vs. Atlanta United, 9 p.m.
• Club America vs. Minnesota United, 9 p.m.
• Real Salt Lake vs. San Luis, 9:30 p.m.
• Portland Timbers vs. Queretaro, 11 p.m.

Sunday, Aug. 3

• Cincinnati vs. Juarez, 5:30 p.m.
• Chivas Guadalajara vs. Charlotte, 7:50 p.m.
• Monterrey vs. RBNY, 8:30 p.m.
• Colorado Rapids vs. Club Tijuana, 9:30 p.m.
• Seattle Sounders vs. Santos Laguna, 10:30 p.m.
• LA Galaxy vs. Cruz Azul, 10:30 p.m.

Tuesday, Aug. 5

• Columbus Crew vs. Club Leon, 7:30 p.m.
• Toluca vs. NYCFC, 7:30 p.m.
• Montreal vs. Puebla, 8 p.m.
• Houston Dynamo vs. Pachuca, 8:30 p.m.
• Mazatlan vs. San Diego, 10 p.m.
• Tigres vs. LAFC, 10:30 p.m.

Wednesday, Aug. 6

• Orlando City vs. Necaxa, 7 p.m.
• Inter Miami vs. Pumas, 7:30 p.m.
• Atlanta United vs. Atlas, 7:30 p.m.
• Minnesota United vs. San Luis, 8:30 p.m.
• Real Salt Lake vs. Queretaro, 9:30 p.m.
• Club America vs. Portland Timbers, 9:30 p.m.
• Seattle Sounders vs. Club Tijuana, 11 p.m.

Thursday, Aug. 7

• Cincinnati vs. Chivas Guadalajara, 7 p.m.
• Monterrey vs. Charlotte, 7:30 p.m.
• RBNY vs. Juarez, 7:30 p.m.
• Cruz Azul vs. Colorado Rapids, 8:30 p.m.
• LA Galaxy vs. Santos Laguna, 11 p.m.

Following completion of the group stage, the quarterfinals will still be set with MLS facing Liga MX as follows:

• MLS 1 vs. LIGA MX 4
• MLS 2 vs. LIGA MX 3
• MLS 3 vs. LIGA MX 2
• MLS 4 vs. LIGA MX 1

When is the knockout phase, semifinals, final and more?

• Phase One: July 29 - August 7
• Quarterfinals: August 19-20
• Semifinals: August 26-27
• Third Place: August 31
• Final: August 31

What are the tiebreakers?

For any clubs level on points after the end of Phase One, the following tiebreakers will be applied in order:

1. Wins in regular time
2. Goal differential
3. Most goals scored
4. Fewest goals conceded
5. Fewest points in the fair play table (yellow and red card accumulation)
6. Draw organized by Leagues Cup