"He was pain-free pitching, but the ball just wasn't coming out, throwing 85 miles-per-hour," Phillies manager Ryne Sandberg said. "That was a sign for me to go out and see what was going on."
Martin faced just four batters in the inning; he did not retire a batter. The 24-year-old righthander allowed three runs on three hits and a walk.
Acquired in July 2012 in the trade that sent Shane Victorino to the Los Angeles Dodgers, Martin showed off a live arm last summer upon making his major league debut. Although arguably a better fit in the bullpen, Martin entered camp as a potential starting pitcher competing for a spot in the rotation.
"It's frustrating," Martin said. "I feel like I worked out and did everything I needed to do to prepare to get here. This happens, obviously it's frustrating. But who knows, it might be something tomorrow where I'm able to get back up and going."
The injury to Martin is another blow to an already short supply of starting pitchers in camp.
Jonathan Pettibone has been dealing with shoulder soreness this month. Miguel Alfredo Gonzalez has looked rusty. Cole Hamels entered camp 2 weeks behind the rest of the pitchers after dealing with biceps soreness in November.
Roberto Hernandez, the favorite for the fifth starter's job, suddenly has little competition.
"It's a concern to have a couple guys banged up a little bit with the starting pitching," Sandberg said. "Hamels has come along fine. But it's just a concern with Ethan. But we'll just wait and see what turns up tomorrow after he gets checked out."
David Buchanan, Jeff Manship and Sean O'Sullivan are also in camp as potential starting pitchers. The Phillies are also stretching out B.J. Rosenberg some this spring to have flexibility.
On Twitter: @ryanlawrence21