Atlanta Braves rookie Jason Heyward lived up to the hype in his first major league at-bat when he hit a monster 3-run homer. He had some injury problems later in the season and hit a slump or two but still finished second to Buster Posey in the NL Rookie of the Year voting.

Rockies starter Ubaldo Jimenez, center, threw a no-hitter on April 17. It would prove to be the beginning of a trend as the '10 season saw six no-hitters, two of which were perfect games.

Dallas Braden salutes the crowd after his perfect game against Tampa Bay on May 9. It was the second no-hitter of the year.

On May 29, Kendry Morales landed awkwardly during the celebration of his walk-off grand slam vs. the Mariners and broke his left ankle, ending his season.
 

Roy Halladay celebrates with Carlos Ruiz, right, and Ryan Howard after Halladay threw a perfect game, the third no-hitter and second perfect game of the season.
 

Ken Griffey Jr. of the Seattle Mariners retired from baseball on June 2.

Umpire Jim Joyce, left, shakes hands with Detroit Tigers pitcher Armando Galarraga on June 3. The previous night, Galarraga lost his bid for a perfect game with two outs in the ninth inning on an erroneous call at first base by Joyce.

Heralded rookie pitcher Stephen Strasburg gets shaving cream in the face and has to wear the silver Elvis wig, per Nats' tradition, after his first major league victory against the Pittsburgh Pirates at Nationals Park on June 8 in Washington, DC. The Nationals won the game 5-2 and Strasburg struck out 14.

Boston Red Sox's Daniel Nava hit a grand slam on the first major league pitch he saw, vs. the Philadelphia Phillies on June 12, in Boston.

Edwin Jackson pitched the season's fourth no-hitter on June 25, beating the Tampa Bay Rays.
 

Staff Sgt. Mikki Skinner, a bugler with the West Point Band, salutes after playing "Taps" during a tribute to New York Yankees owner George Steinbrenner, who died July 13.

Matt Garza pitched the season's fifth no-hitter on July 26. Here, he gets the game ball from pitcher Rafael Soriano as pitching coach Jim Hickey looks on.

Alex Rodriguez of the New York Yankees salutes the crowd after hitting his 600th career home run in the first inning against the Toronto Blue Jays as teammate Robinson Cano looks on on Aug. 4 at Yankee Stadium.

On Aug. 10, the Cincinnati Reds' and St. Louis Cardinals rivalry reached a boiling point, resulting in a benches-clearing brawl.

Chicago Cubs manager Lou Piniella listens to the national anthem before the start of his last game, against the Atlanta Braves, Sunday, Aug. 22, in Chicago.

Former Cincinnati Reds great Pete Rose stands on first base as he acknowledges the crowd during ceremonies celebrating the 25th anniversary of Rose breaking Ty Cobb's hit record prior to a game between the Reds and Pittsburgh Pirates, Saturday, Sept. 11, in Cincinnati.

Dodgers manager Joe Torre and coach Don Mattingly speak to the media on Sept. 20. Torre announced he was stepping down as Dodgers manager at the end of the season. Mattingly will take over.

Halladay is mobbed by teammates after his no-hitter is finally completed with a Brandon Phillips tapper to catcher Carlos Ruiz in front of home plate.

Retiring Manager Bobby Cox of the Atlanta Braves leaves the field after a ceremony before the game against the Philadelphia Phillies at Turner Field on Oct. 2, in Atlanta.

The moral of this story is that if you come up with a clever Halloween costume, you may get free tickets to a World Series game. Young Liam Roybal, shown with his Ron Washington getup even announced “Play Ball!” before Game 4.

The San Francisco skies provided a dramatic backdrop for Game Two of the 2010 MLB World Series at AT&T Park on Oct. 28, 2010.

Buster Posey, left, hugs Aubrey Huff as the San Francisco Giants celebrate beating the Texas Rangers in Game 5 to capture the World Series title at Arlington, Texas, on Nov. 1. Check out more of the best of 2010