The 1993 United States Interregional Soccer League was an American outdoor soccer season run by the United States Interregional Soccer League.

In 1993, the league introduced the Southern Challenge Cup, a short season for teams which the league was considering for membership. The cup would allow these provisional teams to test their organization before beginning a season long competitive schedule.^[1] During the cup, the four provisional teams also played games against other teams in the league. These games counted both in the USISL and Southern Challenge Cup standings. The cup was capped by a final between the two top teams in which the Riverboat Gamblers defeated the Grasshoppers.

The standings published by the USISL list only the wins, losses, goals scored, goals allowed and total points. They do not provide the number of wins or losses that came through shootouts. They also do not provide the number of bonus points coming from goals or corner kicks.^[2][3]

• Regulation win = 6 points
• Shootout win (SW) = 4 points
• Shootout loss (SL) = 2 points
• Regulation loss = 0 points
• Bonus points (BP): An additional one-point per goal up to a maximum of three points per game.
• Northeast Division and Midwest Division teams received one point per corner kick each game.

It appears the USISL allowed each division to determine how its teams entered the playoffs. In the Atlantic Division, the Richmond Kickers and Charleston Battery played a one-time game to determine who went to the division semifinals, despite the Kickers having six more points in the standings than the Battery. In the Southeast Division, the Orlando Lions had a bye into the Sizzlin' Six Tournament as reigning champions. Therefore, the next four teams entered the divisional semifinals. In the Southwest Division, the top three teams qualified for the playoffs, but the next two teams did not enter. Instead, the Valley Golden Eagles with a 3-13 record entered the divisional playoffs. In the rest of the divisions, the top four teams made the divisional playoffs.

• Greensboro Dynamo 4, Richmond Kickers 1
• Delaware Wizards 4, Raleigh Flyers 2

• Greensboro Dynamo defeated Delaware Wizards (5-0, 2-1)

• Atlanta Lasers 3, Memphis Jackals 2
• Boca Raton Sabres 4, Coral Springs Kicks 1

• Atlanta Lasers defeated Boca Raton Sabres (1-0, 3-2)

July 31, 1993

Oklahoma City Slickers	0-4	Dallas Rockets (TX)
Own goal	(Report)	Curtis Partain 81' Kenny Latham

Taft Stadium, Oklahoma City

Attendance: 1,100

• Dallas Rockets defeated Tulsa Roughnecks (4-3 (OT), 0-3, 1-0)

• East Los Angeles Cobras 7, Montclair Standard Falcons 3 ( Ezzy Ihekoronye 4 goals)
• Valley Golden Eagles 5, El Paso Patriots 2

• East Los Angeles Cobras defeated Valley Golden Eagles (0-6, 3-0, 2-0)

(Ezzy Ihekoronye East Los Angeles Cobras MVP)

• San Jose Hawks 6, Chico Rooks 0
• San Francisco All Blacks 3, Palo Alto Firebirds 2 (OT)

• San Jose Hawks 3, San Francisco All Blacks 0

As the defending champion, the Orlando Lions received a bye into the Sizzlin' Six Tournament. The other five teams were the winners of the divisional playoffs. The Sizzlin' Six Tournament began on Thursday, August 12. The three teams in this tournament with the best regular seasons, the Orlando Lions, Greensboro Dynamo and San Jose Hawks, all had 14-2 records. When they all won their games on Thursday, Friday's results became critical to choosing who would go to the championship game. However, all three teams won again on Friday. With all three teams having the same record, the tiebreaker went to goal differential. The Greensboro Dynamo had a +13 goal differential, the Orlando Lions had a +6 and the San Jose Hawks had a +5. This put the Dynamo and Lions in to the final.^[4] All games were held at the Municipal Stadium, Daytona, Florida.

August 12, 1993
7:00 PM (EST)

Orlando Lions (FL)	5-1	Atlanta Lasers (GA)
Dylan Lewis 20' Sheldon Lee 26' 62' Tim Geltz 65' Ian Gill 83'	(Report)	22' OG Ian Gill PK Chris Hellenkamp  52' Richie Richmond

Municipal Stadium, Daytona, Florida

Attendance: 650

August 13, 1993
7:00 PM (EST)

Orlando Lions (FL)	3-1	Dallas Rockets (TX)
Dylan Lewis Aziz Essaffi 85' Steve Freeman 89'	(Report)	64' A.J. Jones

Municipal Stadium, Daytona, Florida

August 15, 1993
7:00 PM (EST)

Orlando Lions (FL)	1-2	Greensboro Dynamo (NC)
Warren Russ  37' Sheldon Lee 45'	(Report)	53' Aidan Murphy 70' Jason Haupt

Municipal Stadium, Daytona, Florida

Attendance: 1,000

• MVP: Ed Radwanski
• Goals leader: Sheldon Lee, Orlando Lions (19 goals)
• Points leader: Sheldon Lee, Orlando Lions (45 points)
• Assists leader: Michael Araujo, Coral Springs Kicks (11 assists)
• Goalkeeper of the Year: Vince Da Silva
• Coach of the Year: Mark Dillon
• All League
  • Goalkeeper: Vince Da Silva
  • Defenders: Michael Ditta, David Ulmstein, Derek Van Rheenen
  • Midfielders: Patrick Krehl, Ed Radwanski, Jason Haupt
  • Forwards: Sheldon Lee, David Mackey, Justin Wall, Mike Gailey

• United Soccer Leagues (RSSSF)
• The Year in American Soccer – 1993