The 2020 edition of the ATP Tour event will be held at the Khalifa International Tennis and Squash Complex in Doha from 6 to 11 January.
The 31-year-old has slipped to 55th in the WTA rankings, down from a career-high of sixth in 2016.
Nasser defeated his brother Ali in the U-18 boys' category.
Other key players expected to feature at the event include 2013 champion Richard Gasquet, 2018 finalist Andrey Rublev, 2016 Wimbledon finalist Milos Raonic and Fernando Verdasco.
India will now travel to Croatia - two-time Davis Cup champions - next year for the world group qualifiers to be played on March 6-7.
India will travel to Croatia in March 2020 for the world group qualifiers if they win the best-of-five rubber.
He was ushered away and told to hide under the windows of the headmaster's office whilst Jamie, who is 15 months older, was in another classroom.
Earlier, Bautista Agut returned after withdrawing on Thursday following the death of his father and the world number nine sealed an emotional 7-6 (7/3), 6-3 victory.
According to organisers, 42,517 spectators packed into the specially-erected arena in the Plaza de Toros to watch Federer beat the German 6-3,4-6,6-2.
The 2018 champions crashed out in the group stage of this week's tournament in Madrid, with the final on Sunday pitting Rafael Nadal's Spain against Canada.
The winners will face Canada in Sunday's final after the North Americans edged out Russia in the first last-four tie.
Karen Khachanov and Andrey Rublev defeated Djokovic and Viktor Troicki in the deciding rubber.
Britain rested Andy Murray and squeezed out of Group E after winning an all-or-nothing doubles rubber to beat Kazakhstan.
The Qatar team comprises Nasser Al Yafei, Ali Saadi, Meshaal Al Khenji and Sultan Al Malki.
Rafael Nadal won his 26th consecutive Davis Cup singles match as Spain booked their place in the quarterfinals with a 3-0 victory over defending champions Croatia.