Martin (elbow) was traded from the Astros to the Diamondbacks along with J.B. Bukauskas and two other prospects in exchange for Zack Greinke, Jon Heyman of MLB Network reports.

Martin (elbow) underwent Tommy John surgery Wednesday, Chandler Rome of the Houston Chronicle reports.

General manager Jeff Luhnow said Sunday that Martin is slated to receive a second opinion on his injured right elbow later this week, Brian McTaggart of MLB.com reports. "I don't think he's going to be pitching any time soon," Luhnow said of Martin.

Martin sustained a potentially serious elbow injury during Sunday's start for Triple-A Round Rock and was placed on the minor-league injured list, Brian McTaggart of MLB.com reports.

Martin, who was optioned to Triple-A Round Rock on Tuesday, has a mechanical flaw in his delivery he'll address while in the minors, Chandler Rome of the Houston Chronicle reports. "It's frustrating," Martin said after a start Monday. "I know what I'm doing wrong and not fixing it right now. We'll get into it, and it'll come. I know that."

Martin was optioned to Triple-A Round Rock on Tuesday, Chandler Rome of the Houston Chronicle reports.

Martin didn't factor into the decision in Saturday's 7-3 win over the Red Sox, giving up three runs (two earned) on five hits and four walks over four-plus innings. He failed to strike out a batter.

Martin (1-0) gave up two runs on three hits and one walk while striking out nine through 5.1 innings Sunday, earning the win over the Rangers.

The Astros officially selected Martin's contract from Triple-A Round Rock ahead of his scheduled start Sunday against the Rangers, Chandler Rome of the Houston Chronicle reports.

Martin is expected to be called up for his big-league debut Sunday against the Rangers, Jake Kaplan of The Athletic reports.

Martin threw 4.1 scoreless innings in relief Thursday against the Dodgers' Triple-A affiliate Oklahoma City. He struck out six while allowing a hit and two walks.

Martin struck out six and walked three without allowing a hit in four scoreless innings Tuesday against the Pirates.

Martin was sent to minor-league camp Tuesday, Jake Kaplan of The Athletic reports.

Martin entered Sunday's game in the third inning and allowed one run on three hits while striking out one over two innings.

Martin received an invitation to the Astros' major-league spring training, Jake Kaplan of The Athletic reports.

Martin whiffed nine over 5.2 shutout frames Thursday in Double-A Corpus Christi's 5-1 win over San Antonio in the second game of their Texas League semifinals series. He conceded only one hit and one walk in the 98-pitch outing.

Martin struck out eight over seven scoreless, one-hit innings for Double-A Corpus Christi in its 5-4 win over San Antonio on Tuesday.

Martin was promoted to Double-A Corpus Christi and will make his debut for the Hooks on Thursday, Chandler Rome of the Houston Chronicle reports.

Martin was promoted to short-season Tri-City, Houston's affiliate in the New York-Penn League, Jake Kaplan of the Houston Chronicle reports.

The Astros have selected Martin with the 56th overall pick in the 2017 first-year player draft.