Greene, Bleasdale miss out
British medal hopes in the Olympic Stadium were dashed on Monday night as Dai Greene and Holly Bleasdale both missed out.
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World champion Greene ran a strong race in the 400m hurdles but finished an agonising fourth as Felix Sanchez regained the title eight years after his triumph in Athens.
The Welshman, wose preparation was hit by winter knee surgery and a recent virus, fell behind early on but clearly left plenty in the tank for the final 150m.
He finished strongly, moving into fourth, but was unable to trouble the podium places.
Sanchez was the surprise champion. The Dominican won in an impressive time of 47.63 seconds. In London the 34-year-old has has taken almost a second off his season's best and his winning time was his fastest since his 2004 glory.
American Michael Tinsley claimed silver in 47.91 with pre-race favourite Javier Culson only third in 48.10, although his bronze was Puerto Rico's first-ever Olympic medal outside the boxing ring.
Greene's time in fourth was 48.24, while Americans Angelo Taylor and Kerron Clement finished in a disappointing fifth and eighth respectively.
Greene, who crept into the final as a fastest loser, said: "I just felt a bit tired tonight. Obviously it was a big shock in the semi-final - I was surprised everyone went that fast.
"I gave it everything I had tonight. A bit better structure to my race but I was just a bit too tired at the end there and narrowly missed out.''
On the injuries which troubled him over the winter, he said: "It certainly affected my build-up - it meant I couldn't start until halfway through January instead of October time, but I can't argue too much, I had a personal best a few weeks ago.
"I was just found wanting a bit at the end but I couldn't have given anything else tonight.''
Meanwhile, Bleasdale, considered by many an outside medal hope in the pole vault after setting a new British record of 4.71m earlier in the season, bowed out early in her competition.
Bleasdale almost went out without recording a height, only clearing 4.45m on her final attempt.
However, she could not go any higher, failing three times at 4.55 to finish joint sixth.
She said: "The conditions weren't great, it was really bad headwind.
"I'm really disappointed with how I did.
"I felt like I could have jumped around 4.70m but I struggled to cope with the conditions.
"I am trying to look at the positives and to finish in the top eight in my first Olympic final is pretty good, but I am just heartbroken with how it went today.
"I am only 20 and I feel like I could have performed well this year.''
American Jennifer Suhr claimed the title, clearing 4.75m.
She won the gold on countback from Cuba's Yarisley Silva, whose early first failure at 4.45 proved so costly, while the bronze went to former champion Elena Isinbaeva (4.70).