The Romanian spent 40 weeks at No. 1 in 2018, a season that saw her win three titles from a tour-leading six final appearances, amassing a 46-11 win-loss record.
This year Halep has won the Shenzhen Open, the Rogers Cup and her debut Grand Slam crown at Roland Garros.
In addition, she reached the title match at the Australian Open, in Rome and Cincinnati.
“Finishing the season as the WTA World No.1 last year was a huge honour for me,” said Halep.
“To do it for a second time in 2018 feels like a special achievement, especially having also won my first Grand Slam this year. To be able to see my name again alongside the other legends who have achieved the year-end No.1 ranking makes me very proud.”
WTA rankings as of October 15
Simona Halep (ROM) 7421 pts
Caroline Wozniacki (DEN) 6461
Angelique Kerber (GER) 5400
Naomi Osaka (JPN) 4740
Karolina Pliskova (CZE) 4465 (+1)
Elina Svitolina (UKR) 4350 (-1)
Petra Kvitova (CZE) 4255
Sloane Stephens (USA) 4022
Julia Goerges (GER) 3785
Kiki Bertens (NED) 3740
Anastasija Sevastova (LAT) 3240 (+1)
Caroline Garcia (FRA) 3225 (+4)
Garbine Muguruza (ESP) 3225
Darya Kasatkina (RUS) 3150
Aryna Sabalenka (BLR) 3145 (-4)
Elise Mertens (BEL) 3115 (-1)
Serena Williams (USA) 2976
Jelena Ostapenko (LAT) 2863
Madison Keys (USA) 2816
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