A tennis player moving to hit the oncoming tennis ball.
Someone playing tennis.
A tennis player moving to hit tennis ball is the same as someone is playing tennis.
exists e1 p1 s1 x1 x2 x3 x4.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x3) & v_move(e1) & exists e2.(Theme(e2,x4) & Actor(e2,x3) & v_hit(e2)) & n_ball(x4) & of(x4,x2) & n_tennis(x2) & n_tennis(x2) & a_oncoming(s1) & Theme(s1,x4) & (x1 = x3) & n_player(x1) & of(x1,x2))
exists x1 x2.(a_topic(x1) & n_tennis(x1) & of(x1,x2) & n_playing(x2))