Lookout Linkage, 4/5/15

Happy MLB Opening Day everyone! Hope everyone has a fun 2015 season! But until then, we have some business to attend to:

• The Mariners made a last-second bullpen swap, optioning Dominic Leone and calling up Carson Smith.
• Marc W at U.S.S. Mariner looks at what could go wrong for the Mariners in 2015.
• Jeff Sullivan of Fangraphs goes through the teams ranked 1-15 in the relief pitcher depth chart. Sullivan then later wraps up the positional rankings series by taking an overall look at the shape of the league.
• Josh Hamilton will receive no disciplinary action from the MLB for his relapse.
• Grant Brisbee wonders why the Angels were upset over the ruling on Hamilton.
• Craig Edwards at Fangraphs reviews the Jon Singleton contract now that a year has passed since it was signed.
• Pinestripe Alley wonders if Michael Pineda is the new ace of the Yankees.
• Over at SB Nation, Ryan Nanni prepares you for Opening Day.
• Arodys Vizcaino, a Braves pitcher, was banned for 80 games for use of PED's.
• Twins' starter Ervin Santana was also given an 80-game ban for PED use.
• The Royals have signed starter Yordano Ventura to a five-year extension.
• The Braves have acquired starter Trevor Cahill from the Diamondbacks.
• Jarred Cosart has been fined by MLB for betting on sports.
• Craig Edwards of Fangraphs tries to figure out which rotations are the most vulnerable if injury occurs.
• Watch Bo Jackson tell his story to Adam LaRoche's son, who doesn't know who Bo Jackson is.