Meanwhile Nguyen Hoang Thien moved up No. 1,443 while Trinh Linh Giang dropped to No. 1,646.
Both Nam and Thien can improve their rankings with solid performances at the Davis Cup, Asia-Oceania Zone set for February 7 in Ho Chi Minh City.
In the men’s double ranking, Nam also jumped five spots to No. 624 in the world rankings while Hoang Thien dropped two spots to No. 796.