It looks like a straight fight now between Donald and Rory McIlroy - the world's top two - after the German decided to stick to his end-of-season schedule and not add any more counting events.
Kaymer's stunning victory in the WGC-HSBC Champions in Shanghai, achieved with nine birdies in the last 12 holes, lifted him above McIlroy into second place on the European standings.
But Donald's lead is still massive - nearly #900,000 - and that is more than the first prize at the race-ending Dubai World Championship on December 8-11.
Kaymer is next in action for Germany at the World Cup in China on November 24-27 and then goes to South Africa for the Nedbank Challenge - not a European Tour event - before travelling on to Dubai.
McIlroy's fourth place in Shanghai left him more than #985,000 behind Donald, but the Northern Irishman is playing in the Hong Kong Open on December 1-4 as well as Dubai and winning both of them could yet make him Europe's new number one.
Donald, already the leading money-winner on the PGA Tour in America this year, was absent last week while he awaits the birth of his second daughter.
He is due to return at the Nedbank Challenge and may know he has completed an unprecedented double of money list titles in America and Europe in the same year before heading to Dubai.
Masters champion Charl Schwartzel and Lee Westwood, pushed down to third in the world because of McIlroy's closing birdie, are fourth and fifth respectively on the European table.
But Dubai is their next event on the circuit and that puts them out of the running.