Quick Hits: Pirates, Colvin, Free Agents, Dunand

The Pirates hold the top spot in Baseball America's ranking of every organization's minor league system (BA subscription required).  This list has some updates from the original ranking in the 2014 BA Prospect Handbook, as while the top dozen teams remain the same, some clubs have moved up and down the list due to subsequent offseason moves.  The Yankees, for instance, rise to the #13 spot due to their signing of Masahiro Tanaka, as he is technically a "prospect" as an MLB rookie.

Here are some items from around the baseball world…

• Tyler Colvin has accepted his assignment to the Giants' Triple-A affiliate and will report tomorrow, CSNBayArea.com's Andrew Baggarly reports (via Twitter).  Colvin signed a minor league deal with San Francisco in February that contained an opt-out clause if he wasn't added to the team's Opening Day roster.
• While fans may worry that their teams will be hamstrung in the future by massive contracts, Sports Illustrated's Tom Verducci notes that the financial costs aren't as great as they seem given how much revenue Major League Baseball is generating and passing down to all 30 teams.  These big deals also tend to create extra revenue for teams — Verducci cites how the Mariners' huge deal with Robinson Cano helped "a brand that needed polishing," and Cano's presence will help ticket sales and TV ratings.
• High schooler Joe Dunand's streak of eight home runs in as many at-bats has raised the youngster's profile, CBSSports.com's Jon Heyman writes.  Dunand, 18, was considered by some scouting directors to be "a fringe pro prospect," but his homer streak attracted scouts from the Mariners, Angels, Royals, Orioles, Mets, Braves and Giants (among other teams) to his game on Wednesday.  Dunand has committed to North Carolina State but could turn pro depending on his draft prospects.  There's also the matter of Dunand's impressive bloodlines; his uncle is Alex Rodriguez.
• The Nationals announced that right-hander Erik Davis underwent Tommy John surgery today and will miss the entire 2014 season.  Davis made his Major League debut last season and posted a 3.12 ERA and a 12.00 K/BB rate in 8 2/3 IP for Washington.