POSEY PLACED ON SEVEN-DAY CONCUSSION DL

SAN FRANCISCO — Catcher Buster Posey was placed on the seven-day disabled list with concussion symptoms Tuesday, a day after he was struck in the helmet by a 94 mph fastball from Arizona’s Taijuan Walker.

While manager Bruce Bochy said following Monday’s 4-1 victory that Posey was doing fine, the Giants planned to check in with him overnight and re-evaluate him Tuesday. They weren’t going to take any chances with the 2012 NL MVP and 2010 Rookie of the Year.

The 0-1 fastball with two outs in the first inning sent the Gold Glove catcher immediately to ground. Athletic trainer Dave Groeschner sprinted toward the plate and manager Bruce Bochy was right behind. Posey got up on his own but exited the game, with Nick Hundley entering to pinch run and stay in the game behind the plate.

Catcher Tim Federowicz had his contract purchased from Triple-A Sacramento to take Posey’s place, while right-hander Clayton Blackburn was designated for assignment.

Athletics to open some upper-deck seating

OAKLAND — The Oakland Athletics are pulling the tarps and opening a portion of the upper deck at the Coliseum for their upcoming 10-game homestand.

The seats will sell for $15 and be available for games beginning Friday against Houston, the team said, while announcing that 50 percent from purchases will go to “Oakland Promise,” an initiative striving to triple the number of college graduates from the city of Oakland over the next 10 years. The A’s say this is “a thank you to Oakland A’s fans.”

The View Level will include 12,103 additional seats, and are to be available beyond this homestand. Tarps will still cover the area known as “Mount Davis” after it was built for late Raiders owner Al Davis to increase stadium capacity as he returned the team to the Bay Area from Los Angeles in 1995. The seating blocked splendid views of the Oakland Hills.