It is the best ranking in his career and a new high for tennis in the country.

In the men’s doubles rankings, Nam also leapt forward, from world No 587 to 545.

The improvement comes after Nam’s success during two weeks of competition in Japan. The southern province of Tay Ninh-born Nam entered the quarter-final of the Japan F2 Future tennis tournament and the semi-final of the Japan F3 tournament.

Nam, who won the boy’s doubles title at the 2015 Wimbledon Championship along with Indian partner Sumit Nagal, aims to finish in the top 400 this year.

In other news, Nam won’t compete for Vietnam in the Davis Cup 2017, Asia/Oceania Zone Group 2 because of injury. Vietnam will face Iran on April 7-9.

Vietnam will send Truong Quoc Bao, Nguyen Hoang Thien, Pham Minh Tuan and Le Quoc Khanh to play in this event.