Roger Federer at work at Barclays ATP World Tour. He entered his 100th final after beating David Ferrer 7-5, 6-3.

In my previous article, I wrote that Roger Federer had tweaked three things post-US open: Improved first-serve returns, clear posturing to attack the second serve and, most importantly, a more powerful backhand.

In the first semifinal against David Ferrer in Barclays ATP World Tour Finals semis, a real and stern test of the improved Federer SHB was the most discernible aspect of his game.

It is fairly safe to say that Federer has more work to do on this front. One could witness a litany of errors late in the first set which allowed Ferrer to come within two points of claiming the first set.

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Pick: Julian Finney/Getty Images