Milwaukee outfielder Ryan Braun missed the team's game against Washington on Sunday with a lower back injury, according to The Associated Press.
He suffered the injury while swinging in the first inning of the Brewers' 6-0 win over the Nationals on Saturday evening.
"It's definitely not good," Braun said Sunday. "There's no way I can swing a bat today."
"We think it might be spasms," he added.
Brewers' Braun Out With Sore Back