The Astros announced Saturday afternoon they will place left-hander Wandy Rodriguez on the 15-day disabled list Monday with fluid in his left elbow joint and will purchase the contract of top prospect Jordan Lyles, a right-handed pitcher, from Triple-A Oklahoma City.
Lyles, 20, the Astros' Minor League Pitcher of the Year last season, will make his Major League debut on Tuesday, when he gets the start for the Astros against the Cubs at Wrigley Field. He's 3-3 with a 3.20 ERA in 10 starts this year for the RedHawks. Lyles is also scheduled to start June 5 in San Diego, manager Brad Mills said.
"He's been pitching well," Mills said. "His last outing [Wednesday] was six shutout innings and he only threw 77 pitches. He's put some pretty good outings together. Everyone's excited with the way he threw in Spring Training for us and we're excited for him. This will be a good time to see him pitch."Rodriguez underwent an MRI on Saturday morning because of discomfort in his elbow. He was scheduled to start Saturday's game against Arizona, but was scratched on Friday. Rodriguez is 3-3 in 10 starts this season with a 3.41 ERA, and is 3-1 in his past seven starts with a 2.16 ERA.
In Lyles' past seven outings he has been one of the top starting pitchers in Triple-A, posting a 3-1 record with a 2.00 ERA. In that span, he allowed two runs or fewer in six starts and one run or no runs four times.
Lyles, who was the 38th overall pick in 2008, dazzled the Astros in Spring Training, posting a 1.98 ERA in five appearances while competing for the fifth starter's job -- a spot that eventually went to Nelson Figueroa.
To make room for Lyles on the 40-man roster, catcher Jason Castro will be transferred to the 60-day disabled list.
Source- Wandy Rodriguez heading to disabled list, Astros will promote Jordan Lyles | MLB.com: News