NFL fans, meanwhile, will hear an address this week on last year's events from President Bush and team personnel will wear logos commemorating the events.
"All of us in baseball were devastated by the horrific attack on our country last September 11, and it is with a great deal of sadness and grief that we will mark the first anniversary," commissioner Bud Selig said Wednesday.
"We take this opportunity to honor the memories of those lost and to pay tribute to the firefighters, police officers, rescue workers and all those who sacrificed their lives trying to save others," Selig said.
Bush's talk to NFL fans will be shown on CBS and FOX telecasts and played on stadium screens for the 10 season-opening games Sunday that start at 1 p.m. EDT. It will be followed by the Marine Corps Band playing "America The Beautiful."
In addition, sideline personnel from all the teams will wear a 9/11 patch on their clothing along with an American flag.
Members of the New York Giants and Jets will wear caps with the initials or logos of the New York fire and police departments or the New York/New Jersey Port Authority personnel. The Giants open the season Thursday night against San Francisco, part of the celebration of Sept. 11.
The Washington Redskins will wear caps with a Pentagon logo.
During the baseball games, a special logo will be displayed on the field, outfield walls, bases and lineup cards, incorporating the Stars and Stripes, the major league baseball logo, a red-white-and-blue ribbon and the phrase "We Shall Not Forget." Players' caps and outerwear that day will include the American flag, and each fan attending a game that day will receive a commemorative T-shirt that features the logo.
Fans will be encouraged to wear the T-shirt during the game, specifically for the moment of silence.
In addition, New York Knicks players Allan Houston and Charlie Ward will sponsor an event at Madison Square Garden on Sept. 11 called "A Tribute to Grace and Hope."