UNIONDALE, N.Y. — Nothing like a New York derby to kick off the Lamar Hunt U.S. Open Cup for Cosmos B and the Brooklyn Italians.

The two rivals will tussle in a play-in match at Long Island University Brooklyn Sunday at 8 p.m.

The winner will play Lansdowne Bhoys (Cosmopolitan Soccer League) Wednesday, the loser will have to wait until next year.

“If you lose, you’re out,” Cosmos B captain and midfielder Danny Szetela said. “Both teams are going to fight until the last whistle.”

Cosmos B’s confidence is high, especially after registering an impressive 4-0 win at Boston City FC in its NPSL season-opener last Sunday.

“Everyone’s confidence is really high right now,” Szetela said. “Everyone has been playing well, working hard in training. When you get the first win on the road, especially the way that we did it, everyone’s confidence is going to be high.”

As it turns out, the teams are scheduled to play again in league play in Cosmos B’s home opener at Hofstra Soccer Stadium in Hempstead, N.Y. May 15.

“We want to do well in this tournament,” Cosmos head coach Carlos Mendes said. “We realize they’re going to be organized, a difficult team to play against. It will be a good matchup and we need to be ready to play. I’m excited for it.”

In NPSL action last year, the Italians (9-2-1) finished second in the Atlantic Blue Conference, while Cosmos B (6-4-2) took fourth place. Brooklyn won both encounters, 2-1 away and 1-0 at home. So, Cosmos B has something to prove.

“It’s sort of like a rivalry that can go farther down the years,” Szetela said. “It’s something that we can build on to make it exciting. I think there will be a lot of fans at the game. I know the Five Points will be there and the rest of the Cosmos fans.”