Despite losing Justin Upton this offseason the Diamondbacks organization was excited about one addition in particular — Didi Gregorius. And he’s done nothing but rake since being called up to the team last weekHe has two hits in each of his three starts and already has hit 2 HR in the process. The start is great, but you better enjoy it while it lasts. First, he has never shown a lot of power in the minor’s as his highest ISO was .184 in 48 games last year at Triple-A. Right now his ISO though three games is a ridiculous .636.There’s also the problem of what the Diamonbacks will do once Aaron Hill returns. Does Martin Prado move to third base? It’s possible, but the Diamondbacks also have Cliff Pennington to play short if Gregorius hits a slump. Clearly, the plan wasn’t to promote him this early so he shouldn’t have a long leash.Is it possible that Gregorius sticks in the majors and succeeds as a 23-year old? Sure, but if you’re in a 10-12 team mixed league is that really a guy you want to be relying on all season? Try to sell for a quality arm or maybe a 4th OF.4/21 RecapGreg Holland has basically cooled off any closer controversy in Kansas City after this weekend in Boston. He saved both chances in yesterday’s double header in almost perfect fashion — 2 IP, 0 H, 0 ER, 5 K/0 BB — while Kelvin Herrera continued his odd homer binge, giving up the game-winning 3-R HR in Saturday’s game.In other Royals news, we got another great start from Ervin Santana (7 IP, 6 H, 2 ER, 7 K/0 BB) and he has been one of the league’s best pitchers after his first start of the season. Even with that start, in which he allowed 3 HR, Santana has pitched 29 innings with a 2.48 ERA, 1.07 WHIP, 26 K/5 BB, and only 4 HR allowed.Just when people started jumping off the Kyle Seager bandwagon (was there even such a thing?) he is now on a 10-game hitting streak, going 3-for-4 with his first homer of the year yesterday. If he was dropped in your league you should be picking him up.Looking AheadThere were a lot of injuries, but the biggest of note was Albert Pujols. He hasn’t landed on the DL yet, but plantar fasciitis is no joke and I wouldn’t be surprised if the Angels tried to protect him from further injury.Chad Billingsley was placed on the DL with elbow pain, which is always a great sign for pitchers. Sarcasm aside, when is Ted Lilly coming back? Do we care?The Nationals called up Anthony Rendon to replace the brittle Ryan Zimmerman as he recovers from a hamstring injury. Rendon is a top prospect and there’s a chance he gets off to a hot start, but he’s only worth an add in deeper leagues.Monday’s Probable StartersMy recommendations on who you should start in 10-12 team leagues. Bold = start.A.J. Griffin (OAK) @ Felix Doubront (BOS) — Doubront struggles at home (2012: 5.33 ERA, 1.46 WHIP, 82 K/31 BB). Griffin pitched well vs. the Red Sox last year, but these ain’t your 2012 Red Sox.CC Sabathia (NYY) @ Matt Moore (TB) — Two studs, two must-starts.J.A. Happ (TOR) @ Chris Tillman (BAL) — Tillman is an interesting prospect for 2013, but I’d sit him against Toronto. Happ has struggled ever since he dazzled us in his debut.Justin Masterson (CLE) @ Dylan Axelrod (CHW) — The Red Sox showed some chinks in Masterson’s armor in his previous start, but the White Sox are currently boasting a 4.8 BB% and 22.2 K% as a team. Axelrod’s control is too unpredictable to start him in a shallow league.Ricky Nolasco (MIA) @ Kevin Correia (MIN) — The Marlins lineup is bad, and if you can overlook the lack of strikeouts then Correia is a good QS option with a low WHIP. Starting Nolasco on your team is like sticking your hand in a box not knowing whats in there.Felix Hernandez (SEA) @ Brad Peacock (HOU) — An ace against one of the worst lineups in recent memory? Start him! There’s 0.0000001% chance Peacock gets a win in this game.Derrick Holland (TEX) @ Joe Blanton (LAA) — This is an interesting matchup as we have two decent pitchers facing very good lineups in a pitcher’s park. I’ll take my chances with Holland with Pujols banged up, but Blanton is a different story.Shelby Miller (STL) @ Dan Haren (WAS) — Haren is borderline droppable in shallow legaues and Miller is quickly becoming a must-start option every time he takes to the mound.A.J. Burnett (PIT) @ Jonathan Pettibone (PHI) — Burnett has been a strikeout machine so far (no surprise) and the Phillies have struggled to hit the ball early on in 2013. I’m not touching Pettibone unless it’s a NL-only format.Travis Wood (CHC) @ Mike Leake (CIN) — Leake is coming off a great start last week and has a career 2.12 ERA and 1.18 WHIP in four home starts against the Cubs. I’ll pass on Wood on the road in Cincy.Mike Minor (ATL) @ Jeff Francis (COL) — Minor has definitely become one of the better young SPs in the game, which is why I’m willing to start him despite the game being in Coors Field. Francis isn’t on that level though.Kyle Lohse (MIL) @ Jason Marquis (SD) — This is the perfect Lohse starting situation, but Marquis is too unpredictable.Wade Miley (ARI) @ Ryan Vogelsong (SF) — Vogelsong is a good K/BB guy, but he has been very unlucky so far this year (5.89 ERA/3.52 FIP). Miley pitches better at home, but the Giants offense hasn’t exactly been scoring a ton of runs.#ProfStatsNote: We are going to start a new trend (literally) where we post fun and interesting stats we find around the baseball twittersphere with the hashtag #ProfStats. We encourage our readers to do the same, either through your own research or something you come across on the web, and we will post them in our daily recaps!Via @BaseballProfLooking to spot start someone? The Marlins have scored more than three runs just three times this year.In the crazy BABIP department: Shin-Soo Choo is currently leading the league with a .469 BABIP. He’s followed by Chris Johnson (.468) and Torii Hunter (.459).On the other side of the BABIP spectrum, Aaron Hicks (.100), Adam Dunn (.111), and Jason Heyward (.114) make up the bottom three.Speaking of Choo, he has already been hit nine times which is more than all but three teams in the league. Only the Reds, which is the team he plays for, have more than 9 HBPs.Via @ESPNStatsInfoBarry Zito: 7 starts of 7+ IP, 0 ER since start of 2012 season (3rd-most in MLB). That’s one more than Justin Verlander has.