Boro have fired an early warning of a promotion bid with an unbeaten four match record and apart from the ten points gathered, manager Gareth Southgate, as a former defender, will be equally pleased that his team have yet to concede a goal.
Turkish international Tuncay marked what could be his farewell appearance for Boro with an important goal. He had only been on the field a minute before he put the home side ahead.
Southgate has made it clear that he expects Tuncay to leave the club before the transfer deadline on September 1.
It is something of a mystery why the forward has not yet been snapped up by another club.
Several clubs have been linked with him but to date none have reached Middlesbrough's valuation figure.
Tuncay had replaced Marvin Emnes, who was carried off on a stretcher after a challenge by goalkeeper Neil Sullivan. Sullivan was booked for the offence and incurred the wrath of Boro fans.
The overall standard of play was disappointing but there was no question that Middlesbrough deserved a win which makes them league leaders.
Rovers battled hard in defence but they lacked any attacking threat to trouble the home side.
There was never any prospect of them pulling the game around, especially after Leroy Lita doubled the lead in the second half.
The former Reading striker brought the ball down with his first touch and volleyed home with his second. Lita celebrated by taking off his shirt and was promptly booked by the referee.
Doncaster's best first-half effort was a 30-yard shot by midfield player Mark Wilson that went just past the far post.
The game desperately needed a second goal to liven up proceedings and Lita eventually provided it after 71 minutes.