If you're Felix Hernandez or David Aardsma, coming off a career season and preparing for a new one, how do you go about improving?
For the Seattle Mariners coaching staff, that's the kind of challenge they don't mind facing – and bullpen coach John Wetteland said they're up to it.
"In some cases, you don't so much change as make small adjustments, and in this game you have to do that no matter what kind of year you've had," Wetteland said.
Wetteland, of course, should know – he was a three-time All-Star closer who saved 330 games in his carer.
"If you're a pitcher, you know hitters make adjustments," he said. "The more you face a hitter, the more you have to work to stay a click ahead of him. Maybe you add a pitch. More likely, you change location.
"If I had success against a particular hitter, got him out with pitches up in the strike zone, I might try putting him away down and away the next time. Make him start wondering. Make him adjust."
"Sometimes it's just a touch of difference. As a pitcher in this game, you have to be aware that hitters think, too. They watch video. They read scouting reports. They remember what you did against them. You don't go away from your strengths, you add to them."