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11/19/09 8:50 PM ET

Nats take precaution with Strasburg

Knee injury not serious, but righty scratched from start

WASHINGTON -- Nationals right-hander Stephen Strasburg has been scratched from Saturday's start in the Arizona Fall League championship game because of a twisted left knee, suffered during a Phoenix Desert Dogs workout on Thursday afternoon.

The injury is not considered serious. An MRI showed inflammation in the knee.

As a precaution, Strasburg is scheduled to fly to Los Angeles on Friday to be examined by Dr. Lewis Yocum.

Strasburg, who was the first overall pick in the 2009 First-Year Player Draft, made five starts, going 4-1 with a 4.26 ERA. He struck out 26 batters in 19 innings for the Desert Dogs.

It marks the second time Strasburg was injured during the AFL season. Previously, a neck injury forced him to miss a start.

Strasburg reportedly hurt his left knee while shagging fly balls.

Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.