NL Notes: Amarista, Nationals, Morse, Krol

 Here are a few National League notes as we head into the weekend:

• Padres utilityman Alexi Amarista has switched his representation to Martin Arburua, tweets Jon Heyman of CBSSports.com. Per MLBTR's Agency Database, Amarista was formerly represented by Proformance. The 24-year-old, who has slashed .280/.309/.452 in 98 plate appearances thus far in 2013, is set to be arbitration eligible beginning in 2015.
• The Nationals are approaching opt-out deadlines for two left-handed relievers that are currently stashed in the minors, explains James Wagner of the Washington Post. Both J.C. Romero and Bill Bray are eligible to elect free agency in June if they are not added to the big league roster. While Washington still has uncertainty in its lefty bullpen options, with Zach Duke scuffling and Fernando Abad only recently added to the squad, its decisions on Romero and Bray will be complicated by injuries to the two southpaws. Romero last saw action on May 8; Bray's last appearance was May 14. Of course, the Nats could always seek to extend those opt-out dates, which could be beneficial to both the team and the players.
• The major decision facing the Nationals this past offseason was whether to bring back free agent Adam LaRoche and, if so, what to do with slugging outfielder/first baseman Michael Morse. With over a quarter of the season in the bag, the Washington Post's Adam Kilogre looks back at the team's ultimate decision to re-sign LaRoche and send Morse to the Mariners. Given the way the season has developed, Kilgore posits, Morse would likely have already been able to achieve over 100 at-bats even with LaRoche in the fold. It is easy to second-guess the decision with Morse's solid start (.244/.310/.462 but with ten long balls) and the struggles of young power-hitter Tyler Moore (.121/.157/.227 and just one home run in 70 plate appearances). Nevertheless, Kilgore explains, the club was not only concerned with carrying Morse's salary and relegating a still-in-his-prime veteran to a secondary role, but needed to recoup some future value after dealing high-end prospect Alex Meyer for center fielder Denard Span. 
• As Kilgore notes, the Nats not only landed high-upside pitching prospects A.J. Cole and Blake Treinen in the Morse trade, but also were entitled to a player-to-be-named later. The PTBNL turned into another arm, left-handed reliever Ian Krol, who has flashed promise in his time with the organization. Kilgore points out that Krol has given up only two runs over 22 2/3 innings while working out of the pen for the Nats' Double-A affiliate. The 22-year-old Krol adds another internal option to supplement the team's less-than-inspiring southpaw relief corps.