The China international netted a last-minute winner for United on the night.

In the final minute Dong powerfully burst clean through on goal, only to be hacked down by Boro skipper John Grounds on the edge of the area.

Grounds was promptly sent off, and Dong hit a deserved winner when he powered the resulting free-kick home, via a slight nick off Gaizka Mendieta. It was a third goal in two games for the Chinese international, and a second league victory of the season for the Reserves.