Great Britain's Mo Farah says he is targetting the 10,000 metres at the London Olympics and will wait to see how he feels before deciding whether to go for a double in the 5,000.
"I am going to run the 10,000 for sure because it is the first race," Farah said after winning the 5,000 at the Diamond League's Prefontaine Classic on Saturday.
"I will see how I feel after that. It depends how I come off in the 10,000. I would like to be fresh and not have any niggles."
Last year Farah doubled at the World Championships in Daegu, winning gold in the 5,000m and silver in the 10,000m. Both races were determined by sprints to the finish in the home straight.
Farah showed Saturday that he has the fitness to maintain a quick pace, winning in a time of 12min 56.98secs in front of a crowd of more than 12,000 at Hayward Field.
Isaiah Kiplangat Koech of Kenya was second in 12:57.63 and American Galen Rupp finished third in 12:58.90. Reigning Olympic gold medalist and world record holder Kenenisa Bekele of Ethiopia finished fourth in 13:01.48.
"The crowd got behind me. I was really pleased. It was awesome," the 29-year-old Farah said.
"It was kind of an up and down pace. I started reasonably good then slowed down in the middle and then towards the end I picked it up again.
"The conditions were a little windy today so I wasn't as perfect as what I wanted. But at the end of the day, I think the most important thing was to get a win under my belt."
It is going to be a whirlwind summer for Farah. Not only will he compete in the Olympics in August but his wife is expecting twins in mid-September.
"It has been tough on my wife but I have to do what I do. I am looking forward to the twins," Farah said.
He declined to say whether the twins are identical or what sex they were.
Farah, who now trains in nearby Portland, said being the British favourite on home soil will spur him on, rather than make him nervous.
"It gives me a good advantage," he said. "But everybody else will be showing up early to try and get used to everything.
"I am more of a positive person than a negative one," Farah said. "I like to have a crowd behind me."
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