Brad Ziegler (knee) is progressing well in his recovery from microfracture surgery, but he's unsure if he will be ready for the start of spring training, the Arizona Republic reports.

Ziegler (knee) is progressing well in his recovery from microfracture surgery, but he's unsure if he will be ready for the start of spring training, the Arizona Republic reports.

Analysis:

Fortunately, Ziegler won't need as much time during spring training to build up endurance since he's a reliever rather than a starter, and he expressed optimism about being ready to pitch by Opening Day.