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The graph below shows Washington’s winning percentage after each game this season:

wash winp

The season began with a home loss to Miami, the start of a loss-win-loss-win-loss pattern that defined the team’s first five games. The sixth game was a loss to the Jets, followed by a win-loss-win-loss-win-loss pattern that brought the team’s record to 5-7. Finally, after three straight wins, Washington now has a winning record at 8-7. In the process, the team clinched the disappointing NFC East: that’s because the Eagles and Cowboys will finish with losing records, while the Giants would lose a tiebreaker (based on NFC record) to Washington at 8-8.

The last time Washington made the playoffs, it was with a quarterback drafted in 2012 and following a slow start, too: that year, the team began 3-6 but finished 10-6. There are more than a few similarities between those two teams, particularly at quarterback. Over his last 9 games, Kirk Cousins has completed 72% of his passes for 2,570 yards (8.57 Y/A), with 20 TDs and 3 INTs, while also rushing for four touchdowns. In RG3’s last 10 games of his rookie season, he threw for 2,039 yards (8.0 Y/A) with 16 TDs and 4 INTs, while also rushing for 574 yards with three scores.

But what I’m more curious about today is something I’ll call average winning percentage. After game 1, Washington’s win percentage was 0.000; after a week two win, the team’s winning percentage was 0.500, which means its average winning percentage through two weeks was 0.250. A loss the next week dropped the team’s winning percentage to 0.333; that gave Washington an average winning percentage through three weeks of 0.278. The table below shows the team’s actual winning percentage and average winning percentage after each game this year:

GmOppW/LWin %Avg Win%
1Miami DolphinsL0.0000.000
2St. Louis RamsW0.5000.250
3New York GiantsL0.3330.278
4Philadelphia EaglesW0.5000.333
5Atlanta FalconsL0.4000.347
6New York JetsL0.3330.344
7Tampa Bay BuccaneersW0.4290.356
8New England PatriotsL0.3750.359
9New Orleans SaintsW0.4440.368
10Carolina PanthersL0.4000.371
11New York GiantsW0.4550.379
12Dallas CowboysL0.4170.382
13Chicago BearsW0.4620.388
14Buffalo BillsW0.5000.396
15Philadelphia EaglesW0.5330.405

A win in week 17 against Dallas will raise the average winning percentage for Washington in 2015 to 0.415; a loss will still raise it to 0.411, since an 8-8 record would be better than the average winning percentage of the team through 15 games. In the abstract, this may not mean much, but where does that compare to other playoff teams?

In 2012, Washington had an average winning percentage of 0.504; that’s below average for a 10-6 team, but obviously a bit better than this year’s team. The table below shows the 20 playoff teams with the worst average winning percentages in pro football history: as you can see, Washington’s 2015 team will slot in just outside of the top 10:

RkTeamYearLgRecordAvg Win%
1Tampa Bay Buccaneers1982NFL5-40.274
2Buffalo Bills1963AFL7-6-10.346
3New Orleans Saints1990NFL8-80.347
4Detroit Lions1995NFL10-60.354
5San Diego Chargers2008NFL8-80.366
6San Diego Chargers1992NFL11-50.384
7Buffalo Bills1948AAFC7-70.387
8Cincinnati Bengals1970NFL8-60.403
9Pittsburgh Steelers1989NFL9-70.407
10Denver Broncos2011NFL8-80.411
11Buffalo Bills1949AAFC5-5-20.413
12New York Jets1981NFL10-5-10.420
13New England Patriots1994NFL10-60.422
14Arizona Cardinals1998NFL9-70.426
15Philadelphia Eagles1990NFL10-60.435
16Houston Oilers1990NFL9-70.438
17San Diego Chargers2013NFL9-70.442
18Minnesota Vikings2008NFL10-60.442
19Indianapolis Colts1987NFL9-60.447
20Jacksonville Jaguars1996NFL9-70.449

The 1982 season was strike-shortened to just nine games and the league allowed 16 teams to make the playoffs; as a result, a Tampa Bay team that started 0-3 and 2-4 made it to the postseason, and the 9-game schedule didn’t provide enough of a runway for the team’s average winning percentage to improve.

In 1990, the Saints made the playoffs at 8-8, and held 0-2, 1-3, 2-5, 4-6, 5-7, and 6-8 records at various points. In 2008, the Chargers were 0-2, 2-3, 3-5, and 4-8, before going on a four-game winning streak to win the AFC West at 8-8. Three years later, the Tim Tebow Broncos were 1-4 and 2-5 before winning six straight games. That was followed by three straight losses, but the 8-8 record was enough to clinch the division.

Given the team’s average winning percentage, and its expected last-place finish in the division, that makes Washington one of the most unlikely playoff teams in recent memory. Washington fans sure like that.

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