Le Mans winner Stéphane Ortelli, triple DTM Champion Rene Rast (against whom Rosina would compete) and German touring car legend Uwe Alzen, and notable Dutch Sportscar pilot Patrick Huisman are all graduates of the series.

Winning points in his rookie season, the next year the Slovak would score two podiums,[2] the second at a torrential Silverstone,[3] during which he memorably led the race from eventual winner Sean Edwards.

[7] Despite a DNF early in the race due to a puncture, his performance was enough to earn a factory drive for Reiter the following season, as halfway through 2012 Reiter brought the Slovak to replace ex-Formula 1 and Le Mans GT class winner Tomas Enge in the FIA GT1 World Championship alongside former Formula 3000 champion and Le Mans class winner Peter Kox.

The high point was a win at Zolder in which Rosina defended the lead for several laps from future multiple time sportscar champion and Porsche works driver Laurens Vanthoor.

[9] In 2020, however, he would make a surprise return in races of the experimental GTX category of the International GT Open, the 24H Series, and the DTM Trophy, netting a win and two podiums.

[11][12][13][14] 2020's success in GTX was followed by a full KTM works drive in 2021 and 2022 in the Stephane Ratel-run Fanatec GT2 European Series, again partnering with Reiter Engineering under the team name True Racing.

After a forgettable start at Imola which yielded a sixth place and a retirement, the next round at the Red Bull Ring saw the pair finish first in race 1, followed by a respectable P4 in class the following day.

[20] As Slovakia's most successful sportscar driver, Rosina often acts as colour commentator for Czech and Slovakian live broadcasts of motor racing, particularly Formula 1.

[21][22]  He also starred alongside notable motorsport figures Olaf Manthey, Misha Charoudin and Walter Röhrl in 2022's music video about the Nürburgring, the TF Song (Pineapple King) by British/Austrian rock band the Heizer Monkeys.