American driver Alexander Rossi managed to beat Manor team-mate Will Stevens on his F1 debut despite not having radio communications for half of the Singapore Grand Prix.
Rossi replaced Roberto Merhi ahead of this weekend and crashed during his first practice session on Friday, before being out-qualified by Stevens on Saturday.
However he got ahead of Stevens early in the race and turned in an impressive performance to finish 14th.
It later emerged Rossi had completed half the race without any communication to his pit wall, something he said was difficult to manage at the twisty Marina Bay street circuit.
"[It was] half way through, which made my life difficult," Rossi said about the loss of radio. "But fortunately we were able to relay a lot of information via the pit board, which resolved any potential issues and we were able to manage it quite well."
The loss of radio explains why the American driver had been between Daniel Ricciardo and Kimi Raikkonen before the second safety car restart despite being a lap down.
Rossi should have been released to catch the pack and admits he needs to brush up on his knowledge of safety car regulations.
"I didn't find it that weird, what was happening. Apparently everyone else did so I'll have to look into that and understand what the exact regulation is because I thought the green light would go on for the safety car. But at the end I think we were able to manage letting the leaders by quite well, so at the end of the day it worked out just fine."
After his tough start in FP1, Rossi says he was relieved to turn in a good performance.
"It was good. At the end it was a good result for the team - our main objective was to bring the car home in one piece and get a decent result out of it at the same time, I think everyone can be quite happy with that.
"This is the hardest track to debut on and we got through it relatively unscathed. I'm just pleased the team managed to bounce back from what was a difficult Friday."