“Today is win day” is a clubhouse creed uttered before a game in which a truly elite pitcher takes the mound. This year, that slogan has certainly applied to C.C. Sabathia.

When their ace lefty toes the rubber, the Yankees are one of the most formidable teams in baseball. The team’s 16-5 record behind Sabathia is the highest winning percentage of any pitcher/team combination (minimum 100 innings) in the American League, and second in baseball to only the Phillies and Roy Halladay (16-4). Needless to say, the sight of the big man on the mound probably inspires as much confidence in the players behind him as the fans watching at home and in the stands.

The Yankees currently have the third best winning percentage in all of baseball, and trail the Phillies by only three games for the top spot, so, the team’s strength doesn’t rest solely on Sabathia’s valuable left arm. And yet, there’s no denying that when he pitches, the Yankees seem to have at least a little extra swagger. The same can also be said about the Phillies behind Halladay and Cliff Lee, the Red Sox behind Josh Beckett, and the Tigers behind Justin Verlander.

It’s hard to win with just one elite pitcher. Ask Felix Hernandez. Usually, over a long season, the best teams in baseball are the ones with the greatest depth and balance. But, what about on “win day”?  For just one game, which team can field the most formidable lineup?

In order to answer that question, a representative lineup along with one starter and closer was compiled for every team with a record above .500 (one exception was including the Reds and omitting the Mets). In order to be eligible for the lineup, a player had to reasonably qualify at a position (i.e., start a minimum of five games or be a recent call-up) and, if on the disabled list, be eligible to return before the end of the season. Also, closers were considered to be relievers with the most saves, not the highest WAR, because that’s how each respective manager would likely use their bullpen in our hypothetical one-game scenario. Although some variations could apply, below are the top lineups ranked by average WAR (bWAR and fWAR).

Top One Game Lineups Among Select Playoff Contenders

Note: AvgWAR = bWAR + fWAR/2
Source: Baseball-reference.com and fangraphs.com

In the American League, the pecking order for one game seems to mirror what most people would consider the season ranking. The Red Sox with Josh Beckett enjoy the highest one game average WAR of 29.1, while the Yankees and Sabathia come in second at 26.7, which makes sense when you consider the Red Sox have won all three games in which those two aces have hooked up. However, it should be noted that fWAR gives the best Yankees’ lineup more credit (for an explanation about the differences between fWAR and bWAR, click here), narrowing the gap to 30 versus 29.3.

The rest of the AL falls in line behind the two East division rivals, although the Tigers with Verlander rank within one win above replacement of the Yankees when using baseball-reference.com’s calculation. On an average basis, however, the West-leading Rangers rank as the third most formidable one-game lineup in the American League. Meanwhile, the Indians are the consensus laggard, failing to top 20 WAR in both calculations.

There are more surprises in the National League. Even with Roy Halladay’s dominance, the Phillies can do no better than tie the Brewers for the best one-game lineup. While the Phillies strength is pitching, the Brew Crew is built around offense. Milwaukee’s top three position players all average a WAR over three, something no other N.L. team can claim.

The Reds, the only sub-.500 team considered, rank third in average WAR, which illustrates their lack of pitching depth. On the other end of the spectrum, the Giants, who have the lowest average WAR, enjoy one of the league’s best records. Why? Because four of the team’s starters have an average WAR of at least 2.8. Surprisingly, the Braves also rank near the bottom despite having the second best record in the National League, a discrepancy created in large part because a one-game snapshot ignores Atlanta’s bullpen depth.

Finally, it should be noted that the Diamondbacks would have also tied for the top one-game lineup if not for Stephen Drew’s season ending injury in last night’s game. Before breaking his ankle, Drew had an average WAR of 1.6, which would have boosted the Diamondbacks score to 18.8. What’s more, if you take into account Daniel Hudson’s 0.9 WAR as a hitter, Arizona actually pushes ahead of the Phillies and Brewers.

Which lineup would you choose for win day? Just because WAR picks the Red Sox doesn’t mean it’s case closed.  Some might opt for Halladay regardless of the rest of the Phillies’ lineup, while others might prefer the Yankees’ collection of All Stars. The Reds behind a hot Johnny Cueto wouldn’t be a bad selection, nor would the Tigers with Justin Verlander. Is anyone taking the Pirates? Sometimes fate plays the strongest hand.

Listed below for comparison and further discussion are the individual lineups considered in this analysis.

AL East Top Lineups

Note: Data as of July 20, 2011
Source: Baseball-reference.com and fangraphs.com

AL Central Top Lineups

Note: Data as of July 20, 2011
Source: Baseball-reference.com and fangraphs.com

AL West Top Lineups

Note: Data as of July 20, 2011
Source: Baseball-reference.com and fangraphs.coM

NL East Top Lineups

Note: Data as of July 20, 2011
Source: Baseball-reference.com and fangraphs.com

NL Central Top Lineups

Note: Data as of July 20, 2011
Source: Baseball-reference.com and fangraphs.com

NL West Top Lineups

Note: Data as of July 20, 2011
Source: Baseball-reference.com and fangraphs.com