Ferrer, 32, is currently seventh in the race to qualify for the Nov. 9-16 event in London. Novak Djokovic, Roger Federer and Rafa Nadal have already booked three of the eight spots for the singles.
Tomas Berdych is almost neck and neck with Ferrer, just 25 points behind in eighth spot before this week's tournaments, but ninth-placed Milos Raonic is not far behind, with Grigor Dimitrov and Andy Murray on his heels.
World number 174 Troicki fired 13 aces to canter to victory in just 66 minutes, his first over world number five Ferrer in four matches.
Second seed Murray prevailed 6-3 6-3 over India's Somdev Devvarman in his first match since losing to Novak Djokovic in the U.S. Open quarter-finals.
The Scot capitalised on four of his seven break points against the Indian who skipped the ongoing Asian Games at Incheon, South Korea to focus on the professional tour.
(Writing by Sudipto Ganguly/Amlan Chakraborty; Editing by Ossian Shine and Pritha Sarkar)
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