LONDON, June 18 (Xinhua) -- Swiss master Roger Federer is back to world number one on the latest ATP rankings released on Monday.

The 36-year-old is back at No. 1 for the record 310th week after capturing his 98th tour-level title of career in the Stuttgart Open beating Milos Raonic of Canada in the final.

The Swiss was making his comeback in grass season having skipped the clay season to rest.

Rafael Nadal of Spain dropped down from No. 1 after sitting out last week following his 11th French Open title earlier this month.