SCOTTSDALE — As the Giants went through infield drills Tuesday, Logan Webb walked up and down the first base line, chatting with teammates and showing them some of his new equipment. It was a very normal morning — except for the fact that Webb was the only one wearing a different jersey, and his new spikes are red, white and blue.The longtime staff ace currently is part of a different staff, but he’ll have a somewhat familiar assignment. Before making a fifth consecutive Opening Day start for the Giants, Webb will pitch the World Baseball Classic opener for Team USA.Team USA manager Mark DeRosa made it official on Monday during a workout at the Giants’ minor league facility. Webb will face Brazil on March 6 in Houston for the first game of pool play.“I’m super excited,” Webb said. “It’s an honor just to play for the team, let alone pitch the first game. It’s kind of my job to set the tone so I’m excited about it.”If Team USA advances — a lock given that Pool B also includes Great Britain, Mexico and Italy — Webb will pitch the quarterfinal on March 14, also in Houston. That would be his first...