Many major league players suited up there, including Blue Jays slugger Jose Bautista, Pirates catcher Russell Martin and current IronPigs teammate David Buchanan.
In 2002, Loewen was drafted in the first round by the Orioles. After his first pro season in 2003, he was rated the top prospect in Baltimore's system by Baseball America.
On May 23, 2006, the 6-foot-6, 245-pounder made his major league debut in Seattle in front of dozens of family members and friends. He hit Adrian Beltre in the head, nearly wrecking Loewen's memorable moment.
"He was the second batter I faced," Loewen recalled. "It was supposed to be a pitch away, but it cut right across the plate.
"Luckily, [Beltre] was all right. It was a scary moment for the hitter and pitcher. I never want to see anyone get hurt."
Loewen's major league highlight came on Aug. 22 of that year in a home game against the Twins. He struck out seven and allowed just one run on four hits in a career-long eight innings. His best friend — Nick Markakis, also an Orioles rookie — homered three times.
"We were roommates in short season, A ball, Double-A, Triple-A and when we got to the big leagues, we were roommates," Loewen said. "To have friends do that together on the same day during our rookie years was a pretty special moment for both of us."
While Markakis spent the last decade in the majors — he now is an outfielder with the Braves — Loewen tried to stay on major league radar.
After making six starts to open the 2007 season in Baltimore, Loewen missed the rest of the year because of elbow surgery.
The damaged left elbow allowed him to have another short stint in 2008 with the Orioles before being shut down again.
Loewen used the time to map out the next step in his career.
He suggested to Andy MacPhail, Orioles president of baseball operations at the time, that perhaps he should convert from pitcher to outfielder.
MacPhail said he was about to make the same suggestion.
"Some people look at an arm injury as a bad thing," Loewen said. "I looked at it as an opportunity.
"Looking back on it, everything has been pretty successful up to this point, in my view."
Playing the outfield worked for the next five years in the Blue Jays and Mets systems. He made it back to the majors for a 14-game stint in Toronto in 2011, when he hit .188 (32 at-bats).
After the 2013 season, Loewen faced another crossroads.
When he didn't have a job as an outfielder as 2014 spring training began, he started throwing bullpen sessions again.
Before there was gain, Loewen experienced plenty of pain. Not in his left elbow, though. Just about everywhere else.
"Body movements on the mound, coming set, putting your foot against the rubber, I was a little shaky," he said. "Those simple, everyday movements of a pitcher. My hips were sore. A lot of different places I haven't felt, were sore."
A few scouts came that spring to watch Loewen pitch again before the Phillies signed him as a minor league free agent.
Loewen threw two games last season at Class-A Clearwater before posting a 4-5 record and a 3.31 ERA in 17 starts with Double-A Reading.
This season at Triple-A Lehigh Valley, Loewen is a full-time reliever for the first time in his career.
He isn't throwing gloves, snapping bats or smashing water coolers over the organization's decision to put him in the bullpen or after a bad outing like his most recent one.
Instead, he is reflective.
"Not many people have an opportunity to [play professional baseball]," Loewen said. "I'm happy with whatever I get and I'm going to make the most of it."
While many pro baseball position players dream of pitching and pitchers dream of hitting, Loewen has done both better than most.
And, he'll do either one if it means another shot at the major leagues.