The Slabu ExchangeUFL enters its fourth week of play with just one unbeaten team.

That'd be the Birmingham Stallions, an apparent start-up spring pro football league powerhouse after winning each of the championship games of the reimagined USFL before the league merged with the XFL.

This week, the Stallions put their undefeated record on the line Saturday night against the D.C. Defenders at Birmingham's Protective Stadium. The Defenders enter the game at 2-1 and entered the new UFL as one of the top teams of the XFL, having reached the title game last season.

The UFL will have a pair of high-octane matchups for fans to choose from Saturday night, with the San Antonio Brahmas hosting the Michigan Panthers in a matchup of 2-1 teams.

Here's what you need to know to catch the spring football action this weekend:

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UFL Week 4 games

Saturday

• Memphis Showboats at St. Louis Battlehawks, 12:30 p.m. ET (ABC)
• D.C. Defenders at Birmingham Stallions, 7 p.m. ET (FOX)
• Michigan Panthers at San Antonio Brahmas, 7 p.m. ET (FOX)

Sunday

• Arlington Renegades at Houston Roughnecks, 2 p.m. ET (FS1)

UFL games can be streamed on ESPN+ or the Fox Sports app depending on which network broadcasts the games.

What is the UFL?

The UFL is a merger between two competing spring professional football leagues, the USFL and XFL.

The recreated USFL — with team names harkening back to its 1980s ancestor — opened play in April 2022 with all eight teams headquartered and playing home games in Birmingham, Alabama. For the 2023 season, the league expanded its home stadium footprint.

Dany Garcia and Dwayne "The Rock" Johnson purchased the XFL out of bankruptcy for $15 million and rebooted the 2020 version of the league. The XFL was successfully able to complete its first season in 2023.

The new, merged league was announced on Dec. 31, 2023.

UFL 2024 season schedule and results

Week 1

Saturday, March 30

• Birmingham Stallions 27, Arlington Renegades 14
• Michigan Panthers 18, St. Louis Battlehawks 16

Sunday, March 31

• San Antonio Brahmas 27, D.C. Defenders 12
• Memphis Showboats 18, Houston Roughnecks 12

Week 2

Saturday, April 6

• San Antonio Brahmas 20, Memphis Showboats 19
• St. Louis Battlehawks 27, Arlington Renegades 24

Sunday, April 7

• Birmingham Stallions 20, Michigan Panthers 13
• D.C. Defenders 23, Houston Roughnecks 13

Week 3

Saturday, April 13

• D.C. Defenders 29, Arlington Renegades 28
• Birmingham Stallions 33, Memphis Showboats 14

Sunday, April 14

• Michigan Panthers 34, Houston Roughnecks 20
• St. Louis Battlehawks 31, San Antonio Brahmas 24

Week 4

Saturday, April 20

• Memphis Showboats at St. Louis Battlehawks, 12:30 p.m. ET (ABC)
• D.C. Defenders at Birmingham Stallions, 7 p.m. ET (FOX)
• Michigan Panthers at San Antonio Brahmas, 7 p.m. ET (FOX)

Sunday, April 21

• Arlington Renegades at Houston Roughnecks, 2 p.m. ET (FS1)

Week 5

Saturday, April 27

• San Antonio Brahmas at Arlington Renegades, 7 p.m. ET (FOX)
• Birmingham Stallions at Houston Roughnecks, 7 p.m. ET (FOX)

Sunday, April 28

• St. Louis Battlehawks at D.C. Defenders, noon ET (ESPN)
• Michigan Panthers at Memphis Showboats, 3 p.m. ET (FOX)

Week 6

Saturday, May 4

• Birmingham Stallions at Memphis Showboats, noon ET (ABC)
• Houston Roughnecks at St. Louis Battlehawks, 3 p.m. ET (FOX)

Sunday, May 5

• Arlington Renegades at Michigan Panthers, 1 p.m. ET (FOX)
• San Antonio Brahmas at D.C. Defenders, 4 p.m. ET (FOX)

Week 7

Saturday, May 11

• Memphis Showboats at Arlington Renegades, 1 p.m. ET (ESPN)
• St. Louis Battlehawks at Birmingham Stallions, 4 p.m. ET (FOX)

Sunday, May 12

• Michigan Panthers at D.C. Defenders, noon ET (ESPN)
• San Antonio Brahmas at Houston Roughnecks, 3 p.m. ET (ESPN)

Week 8

Saturday, May 18

• Memphis Showboats at Michigan Panthers, 4 p.m. ET (FOX)
• Houston Roughnecks at Birmingham Stallions, 8 p.m. ET (ESPN2)

Sunday, May 19

• D.C. Defenders at St. Louis Battlehawks, noon ET (ABC)
• Arlington Renegades at San Antonio Brahmas, 4 p.m. ET (FOX)

Week 9

Saturday, May 25

• St. Louis Battlehawks at Arlington Renegades, noon ET (ABC)
• Birmingham Stallions at San Antonio Brahmas, 3 p.m. ET (ABC)

Sunday, May 26

• D.C. Defenders at Memphis Showboats, 2:30 p.m. ET (FOX)
• Michigan Panthers at Houston Roughnecks, 2:30 p.m. ET (FOX)

Week 10

Saturday, June 1

• Michigan Panthers at Birmingham Stallions, noon ET (ESPN)
• San Antonio Brahmas at St. Louis Battlehawks, 4 p.m. ET (FOX)

Sunday, June 2

• Arlington Renegades at D.C. Defenders, noon ET (ABC)
• Houston Roughnecks at Memphis Showboats, 7 p.m. ET (FOX)

Conference championships

Saturday, June 8

• Teams TBD, 3 p.m. ET (ABC)

Sunday, June 9

• Teams and time TBD (FOX)

UFL championship game

Sunday, June 16

• Conference championship winners, 5 p.m. ET (FOX)