SCOTTSDALE, ARIZ. >> Sure, Michael Conforto was one of the Giants’ three marquee free-agent additions to make their team debuts Sunday. But it felt like more than just his first game with a new team to Conforto, who inked a two-year, $36 million contract this offseason.

“I definitely had some nerves,” Conforto said after he exited the game, an eventual 7-6 walk-off win against the Reds. “I had some butterflies. It kind of felt like a micro-debut again.”

Even if it was an exhibition, and an early one at that, it marked the first time Conforto had played baseball competitively since October 2021, before he underwent shoulder surgery and the arduous rehab it entailed.

“It just felt great to be back out there,” Conforto said.

While the Giants are limiting Conforto to DHing for the first chunk of Cactus League play, he is expected to slot in to one of the corner outfield spots on Opening Day. Opposite him should be Mitch Haniger, another free-agent addition (three years, $43.5 million) who also made his Giants debut Sunday.

It was a special occasion, too, for Haniger, who grew up a Giants fan in the South Bay and went on to star at Archbishop Mitty (San Jose).

“It was definitely cool to put on the black and orange and run out there with this team,” Haniger said.

Conforto recorded his first hit with a single the other way in his third and final at-bat, while Haniger struck out twice and misplayed a pop fly in left field, leading to the Reds’ only run against Sean Manaea, who looked sharp while also making his Giants debut.

Manaea got the first batter he faced, Jake Fraley, looking on strikes, then painted the inside corner to send Nick Solak back to the dugout, too. He struck out two, walked none and surrendered three hits over two innings, but most notable might have been his reported radar gun readings.

While there was no publicly displayed readings inside Scottsdale Stadium, Manaea said he was clocked at 93-96 mph. Manaea averaged 91.2 mph on his fastball last season, and said at this time of year, he’s usually in the upper 80s.

The uptick in velocity can be credited to his work at Driveline, working with their weighted plyoballs at their Phoenix facility. It’s the same place Alex Cobb trained last offseason, before he also flashed an increase velocity last spring — and maintained it throughout the season as one of the majors’ more underrated starters.

“He threw the ball really well,” Haniger said. “He shouldn’t have given up a run if I make that play.”

Camilo on the clock >> With the pitch clock’s increased pace, much was made of how the Giants’ slowest worker last season, closer Camilo Doval, would adapt.

Well, in his first outing of the spring on Sunday, following Manaea with a scoreless third inning, there was, indeed, a clock violation.

Only it was committed by Cincinnati first baseman Alex McGarry, who already had two strikes on him and wasn’t set in the batter’s box with eight seconds left on the clock. Home plate umpire Bill Miller rung him up, the first violation involving the Giants this spring to lead to a strikeout.

It went down as one of three punchouts for Doval, who seemed to be entirely nonplussed by the new pace, even making his usual slow-motion jog in from the bullpen.

“That was funny,” Kapler said. “He came in from the bullpen in true Camilo fashion. He was taking his time. But it was fine. He was right on time.”

There were some concerns that less time between pitches could impact velocity, particularly for a reliever that hit 104 mph last season, but Doval doesn’t think so.

“I think it will increase more,” Doval said. “My thought of mind is, we’re going up all the time, not down.”

Middle infield candidates >> While the Giants’ expected pairing up the middle of their infield — Brandon Crawford and Thairo Estrada — got the nod in their Cactus League opener, the duo in the middle of the diamond Sunday might have been more intriguing.

At shortstop, Brett Wisely.

On the other side of the bag, Isan Díaz.

Both players joined the organization within the past year, and each figures to factor in prominently to the Giants’ plans, either in case of injury to either starter, or if the club decides it would like more than two players on its roster who can play shortstop (Crawford and Estrada, as currently constructed).

“We think they’re going to make an impact on our club,” Kapler said earlier this spring. “Maybe early in the season, perhaps a little more in the middle of the season. But I don’t think there’s any question those two guys are going to be instrumental to our success in some way.”

Wisely, 23, lined a single into left field in his first trip to the plate this spring, then came around to score on a double from Joey Bart. Díaz, 26, picked up his first hit in his third at-bat, lacing a line drive into right field, and then stole second.