Hechavarria told reporters he hopes to be ready to play on Thursday.
Duffy was scratched from Tuesday's lineup due to back spasms.
"Just a little back spasm," Duffy said. "It will be a couple of days. It's pretty anticlimactic. It's not something that's serious. I've had back spasms before in my life. Not over the last two years. A little back spasm for a day or two means that I've been getting a ton of reps. Even that can't wipe a smile off my face."
The third baseman is returning to the Rays after missing last season due to a heel problem.
Miller, who will see time at first, second and designated hitter this season, has a fractured little toe on his right foot.
"Obviously it's not too serious, but it can cause -- you know, coming off surgery last season and having such a good offseason, they're being smart with me by being cautious," Miller said. "Last week when I was out there running, I was clearly running differently than I had been. ... Last thing I want to do is cause something more serious."
Gomez to report Friday All of Carlos Gomez's visa issues are solved and the veteran outfielder is expected to be in camp on Friday, said Rays manager Kevin Cash.
"Excited to see him, and then we'll kind of see where he's at," Cash said. "I know he's been working out."
Cash speculated that it would "probably be four or five days" before Gomez gets into a game.
Last week, the Rays and Gomez agreed to terms for an incentive-laden one-year, $4 million contract, but the deal has yet to be announced.
The right-handed-hitting Gomez, 32, slashed .255/.340/.462 for the Rangers with 17 home runs and 13 stolen bases while manning center field in 2017.
Different body Willy Adames, whom MLB Pipeline rates as the Rays' No. 2 prospect, showed up with a different body this spring. He's approximately the same size at 6 feet and 208 pounds, but he's carrying more quality weight than before. The 22-year-old shortstop credited the offseason work he did in Orlando with Hall of Famer Barry Larkin and Seattle's Dee Gordon.
"They really work hard. I think that helped me get more strong," Adames said. "Good weight. Last year, I was 206, but not muscle."
Diet played a large part in Adames' transformation, too. That meant cutting back on pinto beans and white rice.
"Not that I'm not eating them any more, just less," Adames said.
Camp battles The composition for this year's bullpen is fierce, and Ryan Yarbrough and Yonny Chirinos did nothing to hurt their chances in the Rays' 3-1 win over the Twins on Wednesday.
Yarbrough started, allowing a hit and striking out one in two innings of work. Chirinos followed him by allowing no runs on no hits, a walk and a strikeout over 1 2/3 innings.
"They are in the mix," Cash said. "No doubt."
Up next The Rays will host the Orioles on Thursday afternoon in a 1:05 p.m. ET contest at Charlotte Sports Park and the game will air on Gameday Audio. Jake Faria will start for the Rays. Faria is penciled in to be a part of the club's four-man rotation to start the season.
Bill Chastain has covered the Rays for MLB.com since 2004.