A tennis player moving to hit the oncoming tennis ball.
A man taking part in a tennis match
A tennis player moving to hit the oncoming ball is not necessarily in a tennis match.
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 e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x4) & n_match(x4) & of(x4,x5) & n_tennis(x5) & Theme(e1,x3) & Actor(e1,x2) & v_take(e1) & n_part(x3) & (x1 = x2) & n_man(x1))