Matteo Manassero, the 17-year-old Italian whose four-shot triumph at the Castello Masters in Spain on Sunday made him the European Tour's youngest ever winner, is up from 164th to 88th in the world rankings.
Last year's British amateur champion – he was the youngest to lift that title too – began the year ranked 570th.
Martin Kaymer, of Germany, has moved to a career-high third and either he or England's Lee Westwood will end the 282-week reign of No 1 Tiger Woods this week. Woods, not back in action until next week's WGC-HSBC Champions event in Shanghai, is certain to lose the top spot.
Westwood, despite being out of action at the moment because of his calf injury, will take over unless Kaymer records a top-two finish in the Andalusia Masters at Valderrama.