Newly-crowned Olympic 800m champion Kelly Holmes is aiming for a historic second gold when the 1500m heats get under way on Tuesday evening.
British middle-distance legends Seb Coe and Steve Ovett both failed to win the two events at the same Olympics.
But Holmes, riding high after storming to a sensational 800m win on Monday night, is in confident mood.
"I've been training for the 1500m and that was my focus for the season," said the 34-year-old.
Holmes' 1500m challenge begins with her first-round heat at 1838 BST.
If she qualifies safely, she then has the advantage of a clear rest day before Thursday's semi-final, which begins at 1830 BST.
There is then another rest day before the final on Saturday, which again starts at 1830 BST.
Holmes said that she decided to double up in the 800m and 1500m because she did not to want to have regrets after the Games.
Her decision to run in the 800m was only made the night before the heats began.
"I had 10 days of solid training at the holding camp in Cyprus and it gave me the confidence to know I was strong enough.
"I did a session that was just for the 800m and that made my mind up. It gave me the confidence I could get a medal.
"I felt there would be too many risks either way. If I do just the 1500 will I regret not doing the 800 and if I do just the 800 will I regret not doing the 1500?
"Dreams don't always become reality but finally everything went right for me."
Holmes fought past reigning 800m champion Maria Mutola in an epic duel over the last 80 metres to take Britain's first track gold of these Games.
She was in last place after 300m but timed her run superbly to win her first global title in 1 minute 56.38 seconds.
Holmes became the first British woman to win an Olympic title on the track since Sally Gunnell in 1992, and the first since Ann Packer in 1964 to win the 800m crown.
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