Mekhontcev started well, landing with some great shots to establish a 6-4 lead after the first round.
The Russian continued to dominate the contest, with each punch packed with power. Falcao was trying to lure Mekhontcev in and counter, but could not execute the tactics effectively.
The Brazilian found himself trailing by seven points by the final round and could do nothing to affect the contest.
A cracking shot from Mekhontcev forced the referee to give Falcao a standing count and that underlined the Russian's superiority.
Mekhontcev stopped Falcao once more before being awarded a 23-11 verdict.