Pineda threw his second bullpen session of the camp on Wednesday and again looked strong, which is something that comes naturally for the towering 22-year-old.
"He jumps out at you because he's such a physical specimen," said pitching coach Carl Willis. "He's a big, strong young man. Aside from that, I've been pleased that he's been very controlled in camp.
"There have been such expectations -- I think more so from media and fans -- so we're trying to temper that. But he's been very much in control. He's throwing strikes. He's definitely come in here ready to go."
After dominating at Double-A West Tenn and throwing some overpowering games at Triple-A Tacoma last year, Pineda is being given a strong shot at making the Mariners rotation this spring.
There's a long way to go there, obviously, but initial impressions certainly aren't hurting his chances.
"He obviously sticks out when you look at his size," manager Eric Wedge said. "But I like his athleticism on the mound. I like the way he presents the ball at home plate. I like the way his arm works and he throws the ball downhill.
"He moves well in PFP [pitchers' fielding practice] and gets after the ball. It's hard to miss the guy. He's a tremendous physical presence and he's performed, too."