{"playerId":4499,"percentChange":-16.5,"averageDraftPosition":260,"percentOwned":13.7,"playerRaterSEASON":1.7,"playerRater7DAY":-0.5,"mostRecentNews":{"news":"Herrera gave up another homer Saturday against the Red Sox. This time the Royals said that he was not tipping pitches, but just threw a changeup in a bad location to Daniel Nava, the KC Star reports.","spin":"At any rate, the end result is that Greg Holland's job as the closer is a lot safer than it had been prior to this week.","date":"Sun Apr 21"},"fullName":"Kelvin Herrera","seasonOutlook":{"outlook":"Herrera, a hard-throwing right-hander who tore through the Royals' minor league system after being converted to relief in 2011, exploded onto the scene as one of the team's most valuable bullpen assets last summer. His average fastball velocity was clocked highest in the game -- 98.4 mph -- and that gave good balance paired with a changeup more than 10 mph slower (86.9 mph average). Oddly, Herrera was more location/change-of-pace type than someone who tried to overpower everyone, partly because he generated a lot of grounders (57.0 percent rate) thanks to a two-seamer. He's a capable ERA/WHIP helper, and someone who might have a sneaky good holds total.","seasonId":2013,"date":"Thu Feb 21"},"playerRater30DAY":1.7,"playerRater15DAY":-1.7,"positionRank":29}