Grigor Dimitrov consolidated his bid to play in a first ATP Finals by reaching the Stockholm final where he will face defending champion Juan Martin del Potro.
The battle between Roger Federer and No 1 Rafael Nadal for the year-end top spot could go down to the wire with all roads leading to the ATP World Tour Finals in London.
Germany's Julia Goerges clinched a career third WTA title with a straight-sets win over Daria Kasatkina of Russia in the final of the Kremlin Cup on Saturday.
An unpredictable women's season will culminate in fitting style at the WTA Finals, where seven out of eight players can win the trophy and also be crowned year-end world No 1.
Julia Goerges scuppered the prospect of an all-Russian final at the Kremlin Cup by beating Natalia Vikhlyantseva to a showpiece finale with Daria Kasatkina.
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