Giants beat:

Williamson arrives with confidence, big numbers in Triple-A.

ANAHEIM — For a guy who batted 50 times in the minors this season and reached base 30 times, Mac Williamson had to answer a lot of questions Friday about two of the 20 outs that he made for Triple-A Sacramento.

Both of the “pitchers” were position players for the Reno Aces, infielders Cody Decker and Daniel Robertson, during an 18-4 River Cats rout against Arizona’s top farm club on April 11.

Decker got Williamson to ground out on one of the 60 mph balloons he was lobbing to the plate. Robertson struck him out on three fastballs.

“He gave up a home run to

Chris Shaw on the pitch before it,” Williamson said of Robertson. “He was throwing 80 and the first few pitches to me were like 87 and I’m going, ‘What happened? This is supposed to be easy.’ ”

Williamson has made hitting look easy from the moment he arrived for spring training with a new stance and swing. It’s not easy, of course, and Williamson noted that all the hype surrounds “a handful of at-bats here, so take it with a grain of salt.”

Still, the 27-year-old joined the Giants with the confidence one would expect of a player who before Friday had hit 10 homers in 2018 if you count the four he smacked in spring training. Williamson carried that spring to Sacramento, where he batted .487 with a .600 on-base percentage and three doubles to go with the six homers. He also drew seven walks and was hit by a pitch four times.

Williamson knew he probably would not make the team out of spring training, but on the day he was optioned, “reality more or less set in” that despite batting .318 and crushing balls all over the yard and over fences, he would return to Triple-A for a fourth season.

“The goal for everybody here on down to rookie ball is to play in the big leagues,” he said. “If you’re not trying to make it to the big leagues, there’s no reason to play. I felt like I’d had a good spring and did what I needed to do.”

But he also said he was excited to play with Shaw, Austin Slater, Steven Duggar and other familiar teammates at Triple-A, adding that Slater is starting to crush it there. He also was happy to see that the swing and approach that worked in spring training carried over to the season.

“It’s all about executing a game plan, and I think the changes I’ve made have allowed me to be more successful in executing the game plan at-bat to at-bat,” Williamson said. “For me that’s the biggest thing.”

Belt, Crawford off: First baseman Brandon Belt did not start on his 30th birthday. Shortstop Brandon Crawford was off, too, against left-hander

Andrew Heaney. Crawford’s day off is not that surprising. He is badly struggling against lefties thus far. But Belt’s splits are not that bad and he has been hot, homering in each of his past two games.

Manager Bruce Bochy said he is “looking at all the variables” as he tries to boost a moribund offense. He noted that both Brandons started against Diamondbacks lefty Patrick Corbin on Tuesday and will continue to will face others.

“I’m trying to keep everyone involved,” Bochy said. “This is not going to be a platoon. They were not signed for that.”

Briefly: The April 29 home game against the Dodgers has been pushed back an hour to 2:05 to allow the players extra rest after a 7:05 p.m. doubleheader nightcap on April 28. … The Giants placed Hunter

Pence on the 10-day disabled list with his sprained right thumb. Henry Schulman is a San Francisco Chronicle staff writer.