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Raymond Felton was the worst defensive starting point guard in the NBA last season and has done very little to change that in 2013-14.
News of his weight loss in the summer gave fans hope that this would help him stay in front of his matchup, but he continues to struggle, and it has only been made worse by his failings on offense and inability to stay healthy.
Felton was redeemed somewhat by his contributions on offense last year, but that's no longer the case now that he's averaging career lows in points, assists and field-goal percentage.
While Carmelo Anthony and Tyson Chandler are the Knicks' best and most important players, their success over the last three years has ultimately come down to point guard play. They were horrible with the likes of Mike Bibby and Toney Douglas, great during Linsanity as well as Felton's resurgence last season and have now reverted to the former with Felton being unable to produce.
This season has been almost identical to the 2011-12 season before Jeremy Lin's emergence, and it's easy to see why. Even with five point guards on the roster, there's no one to penetrate and break down the defense, and it's unlikely we're going to see that any time soon.