London crowd hail Federer's 100th final

After Roger Federer beats David Ferrer in the semi-finals of the ATP World Tour Finals, the London crowd pays tribute to the Swiss as he reaches the 100th final of his career.

Federer, who won 7-5 6-3, says he had to be on the top of his game to beat the battling Spaniard, admitting Ferrer had the "upper-hand from the baseline" in the first set.

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