Jameson Taillon's Arizona Fall League season is over after just one outing, as the Pirates removed him from the Scottsdale Scorpions roster on Monday due to a tweaked groin.
Taillon, the Pirates' No. 1 prospect and ranked No. 10 overall on MLB.com's Top 100 Prospects list, started for Scottsdale on Oct. 8, tossing two innings and allowing just one unearned run on one hit. He walked one and struck out three. But he also aggravated a groin muscle, leading the Pirates to decide to err on the side of caution and send their top prospect home.
The 22-year-old Taillon reached Triple-A during the 2013 season, finishing the year with a combined 3.73 ERA in 26 starts. The right-hander gave up 143 hits in 147 1/3 innings, walking 52 and striking out 143.
"Jameson tweaked his groin in his first Arizona Fall League outing and we decided it was better to err on the side of caution and end his AFL season," Pirates assistant general manager Kyle Stark said. "We're very happy with the season he's had and look forward to seeing him healthy for the start of the 2014 season."
Jameson was replaced on the roster by right-hander Phil Irwin, who missed most of the 2013 season, though he did make his Major League debut in April after an impressive Spring Training.
Irwin started for the Pirates on April 14 against the Reds, allowing four runs on 4 2/3 innings. He had made one start prior to that in Triple-A, then made just one more, on May 2, before being shut down. He eventually had surgery on his ulnar nerve in his elbow -- though it wasn't Tommy John surgery -- in July. He was placed on the 60-day disabled list and will try to make up for lost innings in Arizona.
Jonathan Mayo is a reporter for MLB.com and writes a blog, B3. Follow @JonathanMayoB3 on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.