the pair were dicing for 13th place when button hit the back of maldonado 's lotus as they battled for position on the run down to turn 1 .
maldonado , who earlier in his incident-packed race missed the entry to the pit-lane , was sent into a spin , while button sustained damage to his front wing .
jenson button crashed into the back of pastor maldonado 's lotus on lap 49 of the chinese grand prix .