Two basketball players struggle for the ball.
Two basketball players on opposing teams struggled for the ball.
Just because they are struggling for the ball doesn't mean that they are on opposing teams or that they are on teams at all.  They could just be two basketball players playing with a ball.
exists x1 x2 x3 x4.(n_ball(x4) & a_topic(x1) & for(x1,x4) & Time(x1,x3) & n_struggle(x3) & n_player(x1) & of(x1,x2) & n_basketball(x2) & card_eq_2(x1))
exists e1 e2 x1 x2 x3 x4 x5.(n_ball(x5) & for(e2,x5) & Actor(e2,x1) & v_struggle(e2) & Theme(e1,x4) & Actor(e1,x3) & v_oppose(e1) & n_team(x4) & (x1 = x3) & n_player(x1) & of(x1,x2) & n_basketball(x2) & card_eq_2(x1))