Jerome Miron-USA TODAY Sports

Adrian Martinez threw four touchdown passes and the Birmingham Stallions remained undefeated with a 39-21 win against the host Memphis Showboats on Saturday.

The Stallions (6-0) became the first United Football League team to clinch a playoff spot and have won 13 straight games dating back to last season in the USFL. The Showboats (1-5) lost their fifth consecutive game.

Martinez completed 23 of 36 passes for 368 yards with no interceptions. Kevin Austin Jr. caught four passes for 108 yards, including an 80-yard touchdown that pushed the lead to 31-9 late in the third quarter. Marlon Williams caught two TD passes.

Memphis seized a 6-0 first-quarter lead on Case Cookus' 10-yard TD pass to Sage Surratt, but the Showboats did not find the end zone again until there was 2:29 left in the game.

More must-reads:

TODAY'S BEST
Celtics HC shares Kristaps Porzingis update ahead of NBA Finals
Real Madrid defeats Borussia Dortmund 2-0 to win Champions League
Drake Maye reportedly being treated as Patriots' QB3
Veteran 1B rejects outright assignment, elects free agency
Giannis Antetokounmpo to play for Greece in Olympic qualifier
Padres lose two top pitchers to injured list on same day
Fever announce remarkable attendance milestone in fifth 2024 home game
Senators reportedly undecided on qualifying defenseman
Lamar Jackson's curious offseason decision costing him significant money
Blue Jays two-time All-Star pitcher lands on IL for second time this season
Lakers set to benefit from Pelicans’ NBA Draft decision
One rookie quarterback is showing 'elite downfield accuracy' during OTAs
Drew Brees thinks he could be NFL’s best broadcaster
Rangers star second baseman hopes rest helps neck issue
Dodgers designate veteran pitcher for assignment after disastrous outing
Christian Yelich ties Brewers franchise record held by Paul Molitor
Jalen Brunson claps back at tiredness narrative after Knicks' playoff exit
Report: Cowboys quietly 'all-in' on Dak Prescott decision
Report: Bulls drop trade asking price for All-Star
Team Penske tops the charts in NASCAR Cup Series practice at Gateway