VIERA, Fla. -- Nationals right-hander Edwin Jackson had his first bullpen session on Wednesday. While Jackson looked solid on the mound, manager Davey Johnson noticed that Jackson was tipping his pitches from the windup.

Johnson could see the pitches Jackson was getting ready to throw before the ball reached catcher Wilson Ramos. When Jackson is in the stretch position, however, the ball is hidden a lot better. Last season, when Jackson pitched from the windup, opposing batters had a .339 batting average against him. When Jackson pitched from the stretch, opposing hitters hit .239.

"His windup and his stretch are a bit different," Johnson said. "I did notice from the windup that he did show more of the ball. It wasn't real obvious."