Laser superstar Tom Slingsby admits he's concerned about his form after slipping into silver medal position at the Olympic sailing regatta.
The Australian world champion finished ninth and second in Wednesday's races - but had to battle back from deep within the 49-boat fleet to achieve both results.
Cypriot world No.11 Pavlos Kontides grabbed a slim overall lead from Slingsby - an outcome the Australian says concerns him.
"It does a little," Slingsby said.
"I'm sailing well but he (Kontides) is down another gear at the moment.
"He's a risk taker and he took some risks today and they paid off again."
There are five races left in the Laser class and Slingsby's performance on Wednesday gives his rivals renewed hope.
"I got rolled today by Denmark and Tunisia and all these guys who I've normally got a speed edge over," he added.
"I don't know whether it's my set-up but sometimes I don't quite have the speed I want and these guys they take advantage of it."
Slingsby's fierce rival, Great Britain's Paul Goodison, jumped to sixth overall, despite a back injury.
Meanwhile, Australia's 49er skiff pairing Nathan Outteridge and Iain Jensen extended their overall lead to 13 points.
Outteridge wore a green snorkel and goggles out to the start line - a joke referencing the dramatic capsize he suffered the day before.
The fun-loving sailor donned the snorkel to keep himself and Jensen relaxed ahead of the race.
And it worked a treat.
They finished second in the day's first race and won the next.
It meant they extended their overall lead to 13 points and remain firmly on course for a gold medal.
Match racing skipper Olivia Price, who celebrates her 20th birthday on Thursday, extended her unbeaten run.
Price and crewmates Lucinda Whitty and Nina Curtis beat Sweden and the Netherlands and are now well clear on their regatta leaderboard, having won all eight of their heats.
Former world champion Krystal Weir is 16th in the Laser Radial after finishing seventh and 35th on Wednesday.
Four time Olympian Jessica Crisp is 14th in the RS:X windsurfer.
The Finn class, featuring Australia's Brendan Casey, had a lay day.