Kazmir (2-0, 1.40 ERA in three starts) experienced triceps tendinitis Sunday after six shutout innings at Minnesota. It was something he also dealt with in Spring Training.
"It was great," Kazmir said of his bullpen session. "I threw off flat ground, but that's something I normally do. I threw all my pitches.
"Bottom line, I think it's the best I've felt all year."
The entire A's rotation will pick up an extra day of rest from Thursday's off-day.
Earl Bloom is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.