REIMS, France—If you were a women’s soccer team, would you rather face a player who scored five goals in a World Cup game, or a two-time world player of the year?

That’s an example of the grim choices—starter Alex Morgan or backup Carli Lloyd?—facing World Cup opponents of the U.S. women’s soccer team.

“I always say we have the best team in the world,” U.S. defender Ali Krieger said, “and the second-best team in the world.”

Within its already deep roster, the U.S. boasts what might be the best offensive attack in a history of being the world’s most decorated women’s squad, with four Olympic and three World Cup titles.

The U.S. outscored its three pool-play opponents 18-0, a Women’s World Cup record. As the No. 1 U.S. faces No. 13 Spain on Monday (12 p.m. ET; FS1 and Telemundo) in the round-of-16 knockout stage, the main question seems to be which players will stand out on a squad of outstanding attackers.