Federer happy with form after London opener

Roger Federer is pleased with his form after starting his quest for a sixth ATP World Tour Finals title with 6-2 2-6 6-4 win over Jo-Wilfried Tsonga at London's O2 Arena.

Remembering Tsonga's remarkable fightback in this year's quarter-finals at Wimbledon, Federer is relieved to begin his campaign at the season-ending tournament with a win.

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