GLENDALE, Ariz. -- As if Brandon Belt hadn't already done enough to impress the Giants in his first Major League camp, his performance Wednesday against the White Sox was impossible to ignore.

Belt knocked an opposite-field homer to left-center and added a double to about the same spot, and that was after he'd already drawn a walk and singled off White Sox left-handed ace Mark Buehrle in the Giants' 5-3 victory.

Now batting .302 with two homers on the spring, the 22-year-old continues to make it a tough decision whether he'll make the Opening Day roster.

"It's not just today," Giants manager Bruce Bochy said. "He's played well. He's had good at-bats. I mean, this thing, it's going to go probably down to the last few days before we know which way we're going to go. He's doing what he can do, and that's play good baseball."

Said Belt of possibly making the roster: "Only thing I can think of is that'd be awesome. That's something I can't control."

What he obviously can control is his bat. Stinging balls to the opposite field with pop is a sure sign of a hitter who knows how to handle the bat.

"That's what he does well," Bochy said. "Good hitters, the bat stays in the zone longer than most."

Belt was a little more humble about his opposite-field shots on this day.

"Sometimes it shows that I'm watching the ball all the way in, but today it shows I was a little late on the fastball," he said of his homer off right-hander Jeff Gray and his double off right-hander Brian Bruney. "It ended up working out for me."

He doesn't have to work much more at impressing Giants starter Tim Lincecum, who said he could envision Belt making the roster and playing first base as he makes the Opening Day start.

"From the way he's been playing, yeah," Lincecum said. "I think it's just a matter of getting out there and getting experience. I think this should help him tremendously going through camp like this and seeing all these different pitchers. He's just done nothing but impress me."

Giants assisting Japan relief efforts

GLENDALE, Ariz. -- The Giants and the Giants Community Fund will make a $12,500 donation to the Northern Japan Earthquake Relief Fund, the club announced Wednesday.

The fund, eestablished by the Japanese Cultural and Community Center of Northern California, will go toward providing food, water, clothing, blankets and shelter supplies to those most in need.

The Giants also will be collecting monetary donations for the relief efforts at their March 28 game against the A's at AT&T Park.

"It is our intention to spread the word amongst our fans and raise awareness for the many ways they can assist the people of Japan," Larry Baer, Giants president and chief operating officer, said in a statement.

For more information on the JCCNC Northern Japan Earthquake Relief Fund go to www.jccnc.org or for a complete list of established funds go to the Consulate General of Japan in San Francisco website at www.sf.us.emb-japan.go.jp.

Wilson set to return to hill Thursday

SCOTTSDALE, Ariz. -- Giants closer Brian Wilson celebrated his 29th birthday Wednesday, and the one present he didn't receive was the chance to hit the mound like he'd like to every single day.

Of course, others have to get their work in during Spring Training, so Wilson will have to wait until Thursday to get back on the mound for the first time since being hit in the backside by a liner Monday.

Feeling fine from that, Wilson says he's already in the mode of being ready on any given day, ready to close out a win for the Giants.

"I come into Spring Training with that attitude," Wilson said Wednesday. "Everyone's got their own idea of what Spring Training is, and for me it's always competition. It's always the game's on the line.

"I don't need any days off. I like baseball. I'd play 12 months a year. I'd have no problem with that."

By pitching Thursday, at least, he can show his wares on St. Patrick's Day. "It's my heritage day, that's all," he said.

With the rest of the world wearing green, the man who donned the orange cleats in the All-Star Game (and beyond, until the shoe police intervened) and who wears a beard of many colors, wouldn't tip his hand on how he might celebrate the day when everyone gets to join him in being Irish.

"It's a good day to wear green," he said with a sideways glance. "Everybody likes to wear green on St. Patrick's Day."