Delgado’s three-year partnership with Grigor Dimitrov ended last month, but he is known for his partnership with Murray.
When he became the Scots’ main coach in May 2016, he couldn’t imagine success after Amelie Mauresmo left the team.
Murray won his first French Open final in June, won his second Wimbledon title in July and ranked No. 1 in the world, winning the final 24 games of the season.
The next year, his hip problems became permanent, but Delgado stayed with Murray for another five years.
He will be the dominant voice in Draper’s ears, the 23-year-old previously admitted to having two coaches.
South Africa Wayne Ferreira briefly joined the team last summer and won his first ATP title in Stuttgart in June. But he left until August, and Draper said he wanted to make things simple.
“I have all the intentions to hope Wayne will join my team for a long time,” he said at the U.S. Open in August.
“In my own head, I am an overthinking person, [so] I like to be as simple as possible.
“I feel like I want to keep it in one voice.”
Delgado is not Murray’s first partner to join the team, as Draper hired Physio Shane Annun and fitness coach Matt Little earlier this year.
The world’s eighth place is scheduled to make a comeback in the three-day UTS finals in London in December.
An arm injury forced him to evacuate the U.S. Open after winning the first round, but he has been working out regularly at the National Tennis Center in London in recent weeks.
