Josh Webster saw his lead in the Porsche Carrera Cup GB halved to eight points with six races to go after two second-placed finishes at Knockhill.
Title rival Michael Meadows claimed a double victory in Fife on Sunday as Webster, from Mickfield, near Stowmarket, was only able to finish runner-up in both races.
But with it being his first outings on the Scottish circuit, the Redline Racing driver was not too disheartened with his weekend performance, having started from third on the grid on both occasions after qualifying took place on a wet track on Saturday.
There was little more than half a second between the 20-year-old and Meadows going through the flag in the final race.
“If he’d made one mistake I’d have been on him,” said Webster, who finished ahead of team-mate Victor Jimenez.
“Michael’s a seasoned racer at Knockhill and I’m pleased to have been that close to him at the end of the race.
“I’d never seen the track before last Tuesday.”
Webster had gone into the weekend off the back of a double-round win at his home track of Snetterton earlier in the month, which had given him a 16-point lead at the top of the championship standings.
In the first race of the day, in round 12, Meadows (Samsung UHD TV Racing), on pole for both races, got the jump from the start and built a six-second lead as Webster spent the first seven laps finding a way ahead of Jimenez.
But once into second, the Carrera Cup scholarship driver was able to close the gap to Meadows, but the defending champion had things under control and drove a well-measured race to victory.
“That’s the best I could have done in the situation,” said Webster.
“My start wasn’t great but the race pace was good. But I spent too much time getting by Victor.”
Round 13 followed a similar pattern, with Meadows converting his pole position into the lead from the rolling start and going clear in the opening laps.
As the race entered the closing stages, Webster started to lap the Pro-Am2 contenders to close the gap right up.
Meadows kept his cool to take another win, but there was little more than half a second between them at the flag.
Pepe Massot (Parr Motorsport) drove a strong race to complete the overall podium.
Webster will be hoping to maintain his lead over rounds 14 and 15 which take place at Rockingham, in Northamptonshire, a week Sunday.