The 32-year-old could be the first fifth-seed player in the history of the game if he maintains his current status, joining Greek player Stefanos Tsitsipas, a semifinalist in the recent Australia Open, and the Australian teenage champion Alex de Minaur.

Anderson (World N.5), Tsitsipas (N.12) and Minaur (N.28) all occupy the best position ever in their careers, according to the ATP Tour's most recent ranking.

Anderson said in a message sent to the director of the event, João Zilhão, that Estoril and Cascais were his favourite locations on the circuit and he couldn't wait to return to play in the tournament.