Who is the best starting pitcher in baseball right now? I think you can make a strong case for Chris Sale, who maybe isn't the first guy who pops into your head, in part because he did miss a few starts with a tender elbow -- technically a strained flexor muscle -- but he's returned to the White Sox and been nearly unhittable.
In fact, he has been unhittable when facing left-handed batters: They're 0-for-32 against him on the season. In his past four outings, Sale has allowed four hits in 25 innings for a .051 batting average against.
Is he the best? Let's do a quick roll call.
The case for: 5-0, 1.59 ERA in seven starts. Has allowed a .126 average against with a 52-to-8 strikeout-to-walk ratio. His slider has been known to make grown men cry. He had a 3.05 ERA in 2012 and 3.07 in 2013, while pitching in one the best home run parks in the majors. Distinctive three-quarter delivery and unusual arm angle have earned him the nickname "The Condor," which is worth bonus points. Arguably improving as strikeout rate has increased and walk rate decreased.
The case against: Has just one 200-inning season in his career and may not get there this year. This hit rate is unsustainable. Concern about elbow. Only one of his seven starts has come against a team with an above-average offense (and that was Cleveland, which ranks seventh in the AL in runs per game).
The case for: He's been the best pitcher in baseball the past three years and should have won three straight Cy Young Awards (he has two). He's 4-2, 3.32 and people say he's struggling even though his strikeout and walk rates are both better than last season. If God needed one pitch to get out the Devil, he just might choose Kershaw's curveball. He's averaged 232 innings the past three seasons. He's pitched in front of a shaky defense, especially with poor range from exiled center fielder Matt Kemp and shortstop Hanley Ramirez. Take away that seven-run game where he lasted 1 2/3 innings and he's been as dominant as ever.
The case against: A 3.32 ERA is a 3.32 ERA. Missed time with a sore back, so you have to worry about that. Has actually allowed three extra-base hits, including a home run, off that curveball, which is three more extra-base hits than he allowed last year with it. Got hammered in Game 6 of the National League Championship Series by the Cardinals last year. Only one outing of more than seven innings this year.
The case for: If you were going to sculpt a pitcher from clay and infuse him with life, you'd want him to look like Darvish and possess his right arm. He's 5-2 with a 2.04 ERA while pitching in a hitters' park. He's leading the AL in strikeouts per nine innings for the second straight year. Darvish has allowed just three home runs this year after allowing 26 in 2013. Kershaw has allowed a lower batting average (300 innings minimum) since 2012, but Darvish doesn't get to face pitchers. He's walking fewer batters, and over his past four starts -- which included games against Toronto, Detroit and Washington, three good offensive teams -- he allowed four runs and struck out 41 in 31 2/3 innings.
The case against: Hey, he's never thrown a complete game either. Still runs up big pitch counts, which can lead to early exits. Has missed a couple of starts with neck stiffness -- this following a nerve problem in his lower back that hampered him last September.
The case for: He's 9-1 with a 2.02 ERA and has 12 quality starts in 12 starts. Leads AL starters in lowest OBP allowed. He's 33-1 over the past two seasons. His splitter has been outlawed by multiple religious groups for defying the laws of nature; batters are hitting .135 against it with 48 strikeouts, two walks and one home run (by Melky Cabrera, on Tanaka's first pitch of the season, which means he's since thrown 315 splitters without much damage). He's rebounded from his one loss with three straight one-run starts.
The case against: It's only 12 starts, so let's see what happens as teams see him again. The quality start stat is a little dubious since he allowed four runs in six innings in his defeat, but only three of the runs were earned. He's allowed eight home runs, so the long ball may prove to be an issue. Struck out 10-plus batters three times in his first five starts but hasn't done it since.
The case for: The reigning AL Cy Young winner is 6-2 with a 3.20 ERA; his strikeout, walk and home run rates are essentially the same as last year. Few pitchers can match his four-pitch arsenal of four plus pitches. Has had four starts with no runs allowed this year. Have to admire the guts to turn down a reported $144 million contract and hit free agency after the season.
The case against: Has never thrown a complete game in the majors. If you're talking about the best at this very moment, Scherzer has allowed 16 runs in his past three starts. Hit rate is back up this year. Had one great season but career ERA is still 3.64.
The case for: Talk about a workhouse. Led the NL in innings (and wins) in 2009 and again last season. This year, he's once again leading in innings and wins. He's 8-3 with a 2.31 ERA and holding batters to a .194 average. His curveball has been known to break knees, spirits and bank accounts. Has a 2.53 career postseason ERA and is the prototypical staff leader. He's third in the majors since 2012 in FIP (fielding independent pitching) behind only Kershaw and Felix Hernandez. Has had six games this season of seven-plus innings and no runs.
The case against: His BABIP this season is .252, far below his .320 of 2012 and .311 of last season, so his hit rate may increase moving forward. Gets to pitch in the NL Central, which, let's face it, has had some pretty weak offenses in recent years, except the team Wainwright pitches for. Does have some blowup starts -- a seven-run and six-run game this year, a nine-run and six-run game last year. (Hey, we're nitpicking here.)
The case for: His FIP is second in the majors over the past three years -- 2.62 to Kershaw's 2.57, and he does that facing deeper lineups. He's 8-1 with a 2.57 ERA this year and just three home runs allowed. Has topped 200 innings in six consecutive seasons. That changeup, oh that changeup. Shakespeare would write love sonnets about it if he were alive today. Batters are hitting .143 against it with 49 strikeouts and three walks and one home run (praise you, Matt Dominguez). Has pitched in front of a lot of lousy defense the past couple of seasons, particularly in 2013, when the Mariners' outfield was especially atrocious. Has the best strikeout-to-walk ratio of his career and faces the pressure of often having to win with one or two runs of support nearly every start. Nicknamed "King" and nobody really has an issue with that.
The case against: Gets to pitch half his games at Safeco Field, where fly balls go to die. Hasn't had an ERA under 3.00 since 2010 or a complete game since 2012. Hasn't had a no-run game yet this year. Can he pitch in a pennant race or big-game situation? Has never had to do that.
The case for: Since he joined the Mariners' rotation in July 2012, he has the best ERA in the AL. Led AL pitchers in Baseball-Reference WAR last season and finished third in Cy Young voting. (See above for notes about bad defense and offense.) His splitter is a thing of beauty: Over the past two seasons batters have hit .174 against it with 99 strikeouts, eight walks and four home runs. Has handed out just four walks in seven starts.
The case against: Missed time with a finger injury this year and wasn't always the most durable pitcher back in his Japan days. No career complete games in the majors. His strikeout rate of 6.4 per nine innings is a little mediocre and he's allowed six home runs after allowing 25 last year. Isn't nicknamed "King."
The case for: Leads the majors with a 1.68 ERA while pitching in that bandbox in Cincinnati. That Luis Tiant-like spin-and-twirl delivery is awesome. Has three complete games and limited batters to a .151 average. His strikeout rate has increased for the third year in a row and is up to 27 percent. With his fastball/cutter/slider/changeup arsenal, he's a four-pitch pitcher and can throw any of them at any time. Has given up more than two earned runs just once so far. One of the best right-handed pickoff moves ever means he shuts down the running game -- one stolen base allowed this year after just three the previous two years (runners were 1-for-10 off him in 2012).
The case against: His .187 BABIP is simply unsustainable. ERA is helped by five unearned runs. Has had trouble staying healthy, making 24 starts in 2011 and 11 last year, so has reached 200 innings just once.
With apologies to: Anibal Sanchez, Julio Teheran, Tim Hudson, Zack Greinke, Madison Bumgarner, David Price, Mark Buehrle, Corey Kluber, Jon Lester, Stephen Strasburg and Sonny Gray, left off for reasons of space, previous track record, lack of a track record, or simply the belief that their hot start isn't sustainable.