MLB All-Star Selection Show 2012: Biggest Storylines Heading into Roster Unveil

The 2012 MLB All-Star rosters will be announced on Sunday and the results of the unveil are sure to have baseball fans talking all the way up until July 10's AL vs. NL showdown at Kauffman Stadium in Kansas City, Mo.

There are sure to be some snubs and many more surprises.

Here is everything you need to know, including the biggest storylines heading into Sunday's selection show.

When: Sunday, July 1, 1 p.m. ET

Watch: TBS

Will Bryce Harper Make the NL Roster?

The 19-year-old Washington Nationals rookie has been playing fearless baseball through the first two months of the regular season.

Harper is batting .274 on the year with eight home runs and 22 RBI. He also has a .475 slugging percentage this season.

In addition to the quality offense, the youngster boasts a .966 fielding percentage in 74 appearances in 2012.

Although there are many players deserving of making the NL roster as reserves on Sunday, it's hard to argue anyone has made as big an impact on their team as Harper. Washington has a 2.5-game lead over the New York Mets in the NL East heading into Sunday.

Derek Jeter Set for 13th All-Star Nod? 

New York Yankees shortstop Derek Jeter is a 12-time MLB All-Star on the AL side and hasn't missed a nod since way back in 2005. Last season, however, Jeter skipped out on the trip due to fatigue.

At 38 years old, Jeter is still playing All-Star-caliber baseball, batting .300 with seven homers and 25 RBI this season. His leadership in the Big Apple has the Yankees five games up on the Baltimore Orioles in the AL East as the All-Star break nears.

The question in 2012, though, is whether Jeter will be on the field for the American League this July.

Follow Bleacher Report Featured Columnist Patrick Clarke on Twitter for more on the 2012 MLB All-Star game.