Second-year manager Kevin Cash and his staff welcomed 40 pitchers and catchers to Charlotte Sports Park, who took the field at 9:30 a.m. ET.
"There's a lot of energy, whereas last year there was more shaking hands and introducing [ourselves]," Cash said.
The first full-squad workout is scheduled for Friday, when the camp expands to 64 players, including 23 non-roster invitees and one player on the 60-day disabled list.
On Saturday at 11 a.m., the 2016 Rays Fan Fest kicks off at Tropicana Field, and the Rays will play their Grapefruit League opener against the Nationals on March 2 at Charlotte Sports Park.