"I haven't hit since my sophomore year in high school," said 22-year-old rookie Brandon Maurer. "I wasn't too good then, I wasn't too good now."
But the session included much good-natured ribbing, fist pumps and smiles.
"It's a good time to get out there and just goof around and mess with each other a little bit and have some fun doing it," Beavan said. "We all used to hit for the most part in high school and stuff. Definitely not a comparison to this level, but we could all at least hit BP."
Beavan's last swing produced a drive above the Edgar's Cantina in left field.
"The last one was my best," Beavan said with a smile. "That was my goal, to put one in that upper deck."
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.