Jonathan Mayo is an MLB.com Draft and prospect expert. He has been a reporter for MLB.com since 1999.
|MLB.com's Jonathan Mayo believes Astros speedster Delino DeShields Jr. and Braves right-hander Cody Martin are the best Rule 5-eligible players not added to 40-man rosters.
More»Callis, Mayo on best prospects in 2014 Rule 5 Draft|
|Jonathan Mayo discusses the Braves leaving Cody Martin and J.R. Graham off the 40-man roster, the recent prospect trades and more in this week's Pipeline Inbox.
More» Cody Martin, RHP, Braves|
|Before making it to the big leagues, the obvious ultimate goal for any prospect, there is another milestone each hopes to reach: being added to his organization's 40-man roster. For many, that decision was made Thursday.
More» Noah Syndergaard, RHP, Mets|
|The 23rd edition of the Arizona Fall League wrapped up with Salt River's win in the championship game over Peoria on Saturday. Once again, the AFL was jam packed with elite-level prospects. That made putting together a top prospects list fairly easy. There were so many good players, it was decided to expand the list to a Top 25, up from the typical 20.
More» Buxton exits game after injuring finger|
|Cubs third baseman Kris Bryant and shortstop Francisco Lindor of the Indians are projected to make big-time Major League contributions in 2015 that could land them Rookie of the Year Award hardware.
More»Mayo, Callis on 2015 ROY candidates|
|The Arizona Fall League regular season is complete, with just Saturday's championship game yet to be played. With all but the Salt River Rafters and the Peoria Javelinas packing up and heading home, it seemed a good time to start taking a look at the best the 2014 AFL had to offer.
More» Appel works five innings of one-hit ball|
|Cuban phenom Yoan Moncada worked out in Guatemala on Wednesday in front of an estimated 60-70 scouts and all reports point to the teenaged infielder being as good as advertised.
|Every fall, Minor Leaguers raise their stock with their performances in the Arizona Fall League. The caveats that are typically thrown out when discussing such matters: it's a small sample size and the AFL is always very hitter-friendly. But it's also true that every year, expectations around some prospects are heightened based on what they did during six weeks in the desert.
More» Greg Bird's solo homer gives East 1-0 lead|
|There were 12 players headed toward free agency who were given qualifying offers to stay with their old clubs. On Monday, as the deadline passed, all 12 declined the offers. That means there is the possibility of a dozen additional Draft picks come June.
More»Ken Rosenthal discusses key free agents|
|MLB.com's Jonathan Mayo answers questions about the game's top prospects, including whether Twins prospect Byron Buxton is unlucky or injury prone.
More»Twins' Buxton ranked No. 1 prospect by MLB.com|
|Don't be surprised if Phillies prospect Roman Quinn, in a completely healthy year, is a breakout guy next year who sprints his way to Philadelphia.
More»Mayo, Callis on speedsters Pompey and Quinn|
|Frank Marcos recently stepped down as director of the Major League Scouting Bureau, a position he held since 1998. The MLSB grew tremendously under Marcos' watch, most notably in the addition of a pro scouting staff, the enhancement of video, both in quality and in delivery to clubs, and the growth of a scout development program, typically known as Scout School.
More»MLB Scouting Bureau hosts invitational in California|
|Yankees prospect Greg Bird tops the AFL in home runs and RBIs, which made him a pretty good choice to start at first base and bat cleanup for the East squad in the Fall Stars Game. The move seemed even smarter when Bird hit a monster home run to lead off the second inning en route to claiming the game's MVP Award.
More» Greg Bird's solo homer gives East 1-0 lead|
|A calf cramp sustained on Friday by Reds outfield prospect Jesse Winker kept him from playing in Saturday's Fall Stars Game in the Arizona Fall League.
More» Winker discusses playing in the AFL|
|To understand why it's important to watch the Arizona Fall League's Fall Stars Game on Saturday, all one has to do is look at the game's history. Plain and simple, if a fan wants to know who the game's next stars will be, he or she should tune in to MLB Network or MLB.com at 8 p.m. ET.
More» Bradley joins the booth to talk Fall Stars|
|The Royals' dream season may have finished just short in the Fall Classic, but that doesn't mean there isn't still hope for the Kansas City fan base. Hunter Dozier, the No. 8 Draft pick in 2013, is among the top prospects working up the pipeline at the Arizona Fall League.
More»Royals prospects on display in Arizona Fall League|
|He was supposed to be there a year ago, joining fellow 2013 first-round college hitters like Kris Bryant and Colin Moran. Instead, D.J. Peterson is in the Arizona Fall League now, The reason for the delay -- a broken jaw from a hit-by-pitch in August -- isn't something the No. 12 overall pick in the 2013 First-Year Player Draft would wish on anyone, but he does see the silver lining.
More»Mariners prospects prepare in the AFL|
|Right-hander Tyler Glasnow headlines Pittsburgh's prospects playing for the Scottsdale Scorpions in the Arizona Fall League.
More»Pirates prospects on display in Arizona Fall League|
|Outfielder Jesse Winker headlines Cincinnati's group of talented prospects honing their craft in the Arizona Fall League with the Surprise Saguaros.
More»Reds prospects on display in Arizona Fall League|
|Trevor Story, the Rockies' No. 11 prospect, can't help but feel good about a year that saw him spend half of the season in Double-A at age 21. He's looking to help further his climb through the organization with his work during the Arizona Fall League season.
More»Rockies prospects prepare in the AFL|