Joe Swash is immune from eviction.
The former EastEnders actor - who is the current bookies' favourite to win the show at odds of 13/8 - beat fellow contestants Martina Navratilova and David Van Day in the first Bush Battle.
The task saw the threesome hurriedly refilling dripping buckets of coloured water before the liquid ran out.
After coming in third place, David is now nominated for eviction next week. Martina will be given another chance to compete for survival.
Before going up against tennis ace Martina, David told Joe: "This is the most formidable sportswoman in this century.
"We must be potty to go up against her, or do we want to get out? Maybe we just want to go home."
Further battles to determine who else will face the public vote will take place over the next four days.
Joe already made a great first impression with his fellow campers by securing everyone a meal when he went up against former Blue singer Simon Webbe in a creepy crawly task.
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