During the discussion of Brandon Bass, a point came up about whether Rashard could guard power forwards. I got curious, and there was a list provided by a commenter of forwards that he felt Rashard didn't guard well. This list was David West, LaMarcus Aldridge, Carlos Boozer, Pau Gasol, Tim Duncan, Kevin Garnett, Lamar Odom, Amare Stoudemire, Chris Bosh, Antawn Jamison, Josh Smith, Andray Blatche, Dirk Nowitzki, and Zach Randolph (that's a heck of a list...). I removed Duncan, since I still consider him a C, but looked at the others. What I did was figure their points per game and rebounds per game for the last three seasons, since Rashard moved to PF. Then I looked at the PPG and RPG against Rashard. By comparing the two, there's a "Lewis Factor" where a positive means the opponent does better than average, a negative means they do worse than average. It's not 100% precise, since there will be some time against Lewis' backup, but given that none of our backup PFs are shutdown specialists and the overall averages also include time against backups, their effect on the numbers should be (relatively) minimal. Areas where Lewis holds opponents to less than average are bolded.

David West: 20.2 PPG, 8.3 RPG
Against Lewis: 21.0 PPG, 6.7 RPG
Lewis Factor: +0.8 PPG, -1.6 RPG

LaMarcus Aldridge: 17.9 PPG, 7.7 RPG
Against Lewis: 14.3 PPG, 8.5 RPG
Lewis Factor: -3.6 PPG, +0.8 RPG

Carlos Boozer: 19.5 PPG, 10.7 RPG
Against Lewis: 19.8 PPG, 10.8 RPG
Lewis Factor: +0.3 PPG, +0.1 RPG

Pau Gasol: 18.7 PPG, 9.8 RPG
Against Lewis: 18.0 PPG, 9.5 RPG
Lewis Factor: -0.7 PPG, -0.3 RPG

Kevin Garnett: 16.4 PPG, 8.4 RPG
Against Lewis: 12.4 PPG, 8.8 RPG
Lewis Factor: -4.0 PPG, +0.4 RPG

Lamar Odom: 12.1 PPG, 9.5 RPG
Against Lewis: 11.5 PPG, 10.3 RPG
Lewis Factor: -0.6 PPG, +0.8 RPG

Amare Stoudemire: 23.5 PPG, 8.8 RPG
Against Lewis: 20.3 PPG, 10.0 RPG
Lewis Factor: -3.2 PPG, +1.2 RPG

Chris Bosh: 23.0 PPG, 9.9 RPG
Against Lewis: 24.9 PPG, 9.9 RPG
Lewis Factor: +1.9 PPG, 0.0 RPG

Antawn Jamison: 20.9 PPG, 9.2 RPG
Against Lewis: 19.8 PPG, 7.8 RPG
Lewis Factor: -1.1 PPG, -1.4 RPG

Josh Smith: 16.2 PPG, 8.1 RPG
Against Lewis: 15.8 PPG, 8.8 RPG
Lewis Factor: -0.4 PPG, +0.7 PPG

Andray Blatche: 10.6 PPG, 5.6 RPG
Against Lewis: 9.5 PPG, 4.8 RPG
Lewis Factor: -1.1 PPG, -0.8 RPG

Dirk Nowitzki: 24.8 PPG, 8.2 RPG
Against Lewis: 25.2 PPG, 7.0 RPG
Lewis Factor: +0.4 PPG, -1.2 RPG

Zach Randolph: 19.7 PPG, 10.8 RPG
Against Lewis: 20.1 PPG, 11.3 RPG
Lewis Factor: +0.4 PPG, +0.5 RPG

As can be seen, Lewis does better than average against quite a few of these power forwards, holding 8 of the 13 to less than their average on points, and 5 of the 13 to below average for rebounding. The only one to score significantly above his average against Lewis is Chris Bosh. Aldridge, Blatche, Stoudemire, Garnett, and Jamison are stifled by Lewis, with all averaging at least a point less than normal. Gasol, Jamison, and Blatche all have trouble with Lewis both scoring and rebounding; Gasol is the least affected, but none of the three are effective against Rashard. This suggests the perception that these players "own" Rashard is based less on how well they do against him compared to the rest of the league, and more based on the fact that these guys are good. Using these players as a baseline, Rashard would appear to be an average to above average defender with regard to scoring, and a below average rebounder.