Cincinnati Reds manager Dusty Baker admits that he is concerned about Aroldis Chapman's recent drop in velocity.

Chapman, who routinely throws his fastball over 100 mph, struggled with his velocity and command in Monday's game against the Pittsburgh Pirates. The All-Star closer threw seven of his 23 pitches for strikes and averaged a season-low 94.4 mph on his fastball, according to ESPN Stats & Info.

"His velocity was down," Baker told reporters after Cincinnati's 14-inning victory. "He didn't have any pain. He might be a little tired. We might have to rest him for a while here."