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4/17/2013 2:00 A.M. ET

Avilan injures left hamstring delivering a pitch

Braves reliever Luis Avilan left Tuesday night's game after delivering a pitch in the ninth inning of Atlanta's 6-3 win over the Royals.

The left-hander grabbed his left leg and fell to the ground while throwing a pitch, with the Braves later saying Avilan sustained a hamstring strain and cramping. He'll be reevaluated on Wednesday.

"Obviously, the way he fell down there, it doesn't look good," said Braves manager Fredi Gonzalez after the game.

The 23-year-old had allowed no runs in four innings of work over four appearances before Tuesday.

The Braves will now rely on left-handed reliever Eric O'Flaherty, who is the only other active left-handed reliever in the team's bullpen. Left-hander Jonny Venters is on the disabled list with an elbow injury and isn't scheduled to throw again for at least another two weeks.

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