Casale won the final Rio Cuarto stage on Saturday morning .
It was only enough to dent Karyakin 's advantage by just over a minute - giving the Russian a final winning margin of 1h16m24s .
Casale won the final Rio Cuarto stage on Saturday morning , but it was only enough to dent Karyakin 's advantage by just over a minute - giving the Russian a final winning margin of 1h16m24s .