Jake Arrieta admitted that he was dealing with arm fatigue as the Chicago Cubs attempted to end their World Series drought this fall.
Arrieta was named the National League Cy Young winner on Wednesday. He threw nearly 250 innings in 2015.
"I think that throwing that many innings this year after not being over, I'm not sure the total, about 170-180 ... you can train and you can prepare and you be in top physical condition but without having a workload like that under your belt it's natural for your body to wear down or let you know, 'Hey, we're getting into an area we haven't been before,'" Arrieta said on a conference call.
"The fatigue did set in. I'll be the first to tell you."
Arrieta threw 229 innings in the regular season which was 73 more than he ever had thrown. He added 19.2 more in the postseason.