Given their respective home ballparks and the lineups each has supporting them, not to mention the likelihood that Cano's .365 BABIP might slip somewhat after the break (he's typically in the .325 range), I don't think it's at all a lock that Cano will be the more valuable asset for the rest of 2014. And if you change the question to who will have the better season in 2015, I'll take the 25-year-old second baseman over the 32-year-old, thank you very much.
Jake Odorizzi, SP, TB: Lost in the Rays' abysmal season has been a remarkable turnaround for Odorizzi, who's racked up a 40:13 K:BB ratio over his last six starts (36 innings) to go along with a 2.50 ERA and 1.19 WHIP after a rough April. As a Royals prospect he always seemed more hype and projection than production, but last year at Triple-A Durham the strikeouts started to arrive, and he's carried the K's forward to the bigs while also beginning to sharpen his control. The 90 mph fastball doesn't say ace, but he's cementing his spot in the middle of the Tampa rotation for the foreseeable future.
Jacob deGrom, SP, NYM: Clubs that have their Triple-A affiliates in extreme PCL hitting environments are starting to become factories for 'surprise' pitchers, simply because their numbers in the upper minors are almost doomed to be ugly. Collin McHugh (who pitched in both Las Vegas and Colorado Springs over the last couple of seasons) and Matt Shoemaker (who managed to survive throwing 423 innings for Salt Lake) both escaped their thin air exiles to achieve some major league success this season, and deGrom is the latest PCL parolee to join them. Despite a 4.52 ERA at Las Vegas last year, he's been rock-solid since joining the Mets' rotation in 2014, rattling off a 2.92 ERA and 40:12 K:BB ratio over his last six starts (37 innings). His arsenal (mid-90s fastball, solid changeup, and an improving slider replacing his fringy curve) seems legit, and he could be a very nice complement to the Mets' higher-profile arms in the middle of a rotation that seems poised to run roughshod over the NL East in the second half of the decade.
Kendrys Morales, DH, Min/Stephen Drew, SS, Bos: After going unsigned this offseason, both Drew and Morales found landing spots a couple of months into the 2014 campaign and have proceeded to make their fantasy owners' lives miserable ever since. Morales, at least, has chipped in with some RBI while sabotaging your batting average (.198/.216/.292 with one home run and 14 RBI over his last 106 at-bats) but Drew has simply been terrible across the board (.147/.210/.293 with two HR and four RBI over his last 75 at-bats). If you write off the month of June as their spring training you can certainly convince yourself a rebound is coming, and they can't get much worse than they've been so far, but there really isn't anything in their recent performances to indicate either of them has turned any kind of corner. Should you want (or need) to take a chance on either of their second halves, buyer beware.
Shin-Soo Choo, OF, Tex: Given all the blame there is to go around for the Rangers' collapse this season, Choo's weak performance hasn't gotten as much attention as it's deserved. Over his last 101 at-bats, he's hitting a weak .208/.283/.307 with three home runs, 10 RBI and 12 runs scored, and while his BABIP is well below his normal rate it is part of a downward trend over the last few years, from .353 in 2012 to .338 last year to this year's .301. It may bounce back after the break, but his days of popping a .350+ BABIP are probably over, and without those extra hits his fantasy ceiling is a lot lower than you paid for back in March.
Alex Cobb, SP, TB: While we all want young players, and especially young pitchers, to be stable investments once they make their breakthroughs, it rarely works out that way in practice. Cobb's outstanding 2013 marked him as the next Rays ace, but his ascension to top starter status has hit a rough patch over the last month, and he sports a 4.40 ERA and 1.40 WHIP over his last five starts (28.2 innings) with a weak 23:11 K:BB ratio. There doesn't appear to be anything physically wrong with Cobb, so he could easily come out of the break on fire, but it's important to remember that just because a wunderkind is on the road to greatness, it doesn't mean that road will be a straight one.
Dan Haren, SP, LAD: After two seasons with outstanding K:BB ratios but not much to success to show for it, Haren flipped the script early in 2014 by striking out fewer guys but posting a solid ERA. Alas, the strikeouts have returned, and with them the damage, as he's posted a 6.49 ERA over his last five starts (26.1 innings) despite a reasonable 1.33 WHIP and very good 26:7 K:BB ratio. The simple fact of the matter is, Haren's stuff isn't going to fool many batters any more, and if he's getting strikeouts it means he's getting too much of the plate. It sounds crazy, but if his K and BB rates start sagging, he might actually be a more viable fantasy asset. As a high K, low BB, high BABIP and high opposition ISO pitcher, he's just too volatile to use.