Jonathan Rea won Saturday's World Superbike race one at Misano to close the gap to series leader Alvaro Bautista.
Heavy rain caused a delay to the start of the race and then the first attempt to run the race was stopped by weather after three laps.
Alex Lowes crashed out of the lead on lap nine, leaving Rea to come home a 3.5-second winner.
Englishman Tom Sykes was second, with Bautista third.
"It is super nice to win again, albeit in difficult conditions. I'm so happy," said Rea on Eurosport after the race.
"I got into a good rhythm but couldn't match Alex's pace - he was on a different level I wasn't prepared to match in those conditions. It was unfortunate for him as he was riding a great race."
"I managed to watch my boards and keep the gap constant but those were the longest 19 laps of my life."