Thien grabbed three bonus point from the Men’s Futures events in previous weeks. He jumps from No 1,602 to his current position, marking his highest place in his career.
Trinh Linh Giang also has a higher rank at No 2,058, one better than previous spot.
Meanwhile their teammate, Ly Hoang Nam, dropped 40 steps to No 653. It was attributed to the cancellation of the Cambodia F2 Men’s Futures this year. Nam, who entered the semi-final round last year, has no chance to defend his six points here.
Positions in the men’s and women’s top 30 are unchanged.
In other tennis news, Thien and his coaches have been donated free flights to all competition venues in one year by Worldtrans.
His first plan after the deal will be a training course and competition in the United States. They departed on December 13.
Thien then will take part in the Davis Cup when Vietnam will host Hong Kong on February 3 and 5.