Midfielder Prince Buaben was on the scoresheet for Watford in their 1-1 draw with Cardiff in the English Championship match played on Monday.
It was the first goal for the 23-year-old Ghanaian since joining the Hornets from Scottish side Dundee United in at the beginning of the current campaign.
Buaben opened the scoring on 62minutes after riffling home a Marvin Sordell pass from inside the box.
The homsters profligacy cost them dearly as the ball clipped off Mariappa off a throw-in and into the net to steal a priceless point in the 80th minute.