Greene struck by injury

Greene was injured in Edmonton last year

World record holder and Olympic champion Maurice Greene was forced to pull out of his first competitive run of the season after pulling a calf muscle in training.

Greene was due to compete in the 100m at the Qatar Grand Prix but did not appear at the start of the race, which was won by Bernard Williams.

Greene, who won three gold medals at the 2000 Olympics, has a history of injuries.

Most recently, the 27-year-old strained a leg muscle while winning the 100m final at the Edmonton World Championships last August in a time of 9.79 seconds.

However, he had looked in good shape when running two 4x100m relays in the United States before travelling to Doha to compete in the event for what would have been the first time.

Williams won in 10.08 seconds, ahead of compatriots Jon Drummond and Joshua Johnson.

European 100 metres champion Darren Campbell, who missed the majority of last season with a hamstring injury, finished a disappointing sixth, clocking an ordinary time of 10.34 seconds.