Positional series: Sox infield a strength

This is the first in a weekly series evaluating the Sox roster by category: infield, outfield, catching, starting pitching and defense. DH? Hey, David Ortiz is in a league of his own, but we’ll take a look at him too.

There is an infield in the American League East that shares 31 All-Star appearances, 12 Gold Gloves, 3 MVPs and a World Series MVP -- and may be the worst infield in the division.

The average age of the Yankees’ infield -- assuming Mark Teixeira at first, Brian Roberts at second, Derek Jeter at short and Alex Rodriguez at third -- will be 36.5 on Opening Day 2014. Even if A-Rod’s suspension is upheld and 32-year-old Kelly Johnson winds up at third, the average drops only to 35. All four starters (Johnson not included) are coming off debilitating injuries, with no certainty that any of them will come close to peak form.

Jeter turns 40 this summer. Only two shortstops 38 or older have ever started a World Series game, according to Baseball-reference.com: Pee Wee Reese of the Dodgers was 38 in the 1956 Series; Phil Rizzuto of the Yankees was 38 in the 1955 Series.

The Red Sox, meanwhile, go into spring training saying they are comfortable with a rookie shortstop, Xander Bogaerts, who was only 25 days past his 21st birthday last October when he was the second youngest player ever to start a World Series game at third base. Only 18-year-old Freddie Lindstrom of the New York Giants, who was 18 years and 318 days when he started in Game 1 of the 1924 World Series, was younger than Bogaerts when he started in Game 3 against the Cardinals in St. Louis and went 2 for 4 with a triple and RBI.

With Bogaerts at short and 25-year-old Will Middlebrooks at third, the Sox would enter the 2014 season with the youngest infield in the AL East, averaging 27 years, almost a full decade younger than the Yankees' infield. The Blue Jays would average 27.5, the Orioles 28.2 and the Rays 30, as things stand now. Re-signing Stephen Drew, who turns 31 on March 16, could alter the Sox numbers a bit.

So we’ve established that the Sox have the youngest infield in the division, but who has the best? By one measure, Wins Above Replacement (WAR), the Rays do, their infielders combining for a 17.4 WAR last season. The Orioles, with corner infielders Manny Machado (6.5) and Chris Davis (6.3) leading the way, come in at second at 16.5, even though new second baseman Jemile Weeks spent last season in the minors.

The Sox are third at 10.8. Of course, Bogaerts (0.3) played in just a handful of games last season, while Middlebrooks (-0.1) battled injuries and slumps. Bogaerts is regarded as one of the best prospects in baseball, an All-Star in the making. The Red Sox were not receptive to trade proposals involving Middlebrooks, reluctant to trade a bat they believe could consistently produce 25 to 30 home runs a year, power that is in short commodity these days.

At the other two infield positions, Dustin Pedroia (6.5) was tops at his position, ahead of Tampa Bay’s Ben Zobrist (5.1), while Mike Napoli (4.1) was second, behind Orioles slugger Davis (6.3) and just ahead of Toronto’s Edwin Encarnacion (4.0).

Another way to measure players’ offensive impact is by OPS+, which takes a player’s combined on-base and slugging percentage and adjusts it for ballpark factor. Napoli, who came in at 129 (100 being average), trailed Davis (165) and Encarnacion (145). Pedroia (116) just edged out Zobrist (113), while Rays third baseman Evan Longoria (134) ranked behind only Davis and Encarnacion.

While the Sox re-signed Napoli to a two-year deal, they did spend some time imagining a world without him. The Sox looked long and hard at Cuban first baseman Jose Abreu, the 26-year-old slugger who signed a six-year, $68 million deal with the White Sox, Boston dropping out when the price went that high. And had Napoli succumbed to the interest shown by the Texas Rangers, the Red Sox were considering opening the season with a combination of Daniel Nava and Mike Carp at first base.

Still, the Sox are clearly a better team with Napoli back, especially at short years, which protects them against his hip condition, a nonfactor in 2013. And perhaps the unexpected bonus comes in the defense Napoli, a catcher by trade, gives them at first base. According to the Bill James 2014 Handbook, Napoli led all AL first basemen in runs saved with 10, just one run fewer than the Gold Glove first baseman he replaced, Adrian Gonzalez. Pedroia, meanwhile, led all major league second basemen in runs saved with 15.

Both Napoli and Pedroia scored high in another defensive metric, plus-minus, with Napoli scoring an AL-best plus-12 at first and Pedroia leading all big-league second basemen with a plus-17. Plus-minus evaluates defensive range by measuring how often defenders turn grounders and fly balls into outs. Zero is considered average.

That’s the right side of the Sox infield. The left side? No one has ever said Bogaerts’ defense is on par with the wizardly Jose Iglesias, and at this stage of his career he probably ranks a couple of ticks below Drew, even though Drew did not score well in the metrics. Middlebrooks was a -8, but with his back issues behind him, that should improve.

In sum? Barring injury, the Sox infield should be a strength of this season’s team, a worthy challenger to any in the division. Napoli and Pedroia are proven run producers, Middlebrooks could be a power bat from the right side, and Bogaerts is the wild card, the rare player who is a star from the moment he makes it to the big leagues, no matter how young.